Best Furnace Filters For Homes With Pets in 2023

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Do you love pets? Aren’t those furry cute little companions are so lovable?

But is any of your family members allergic to animal fur or are you yourself allergic to it?

And is your pet vaccinated?

Even if it is vaccinated but then also animal dander does falls from them. Nowadays many people are developing allergies to various new allergens animal dander constituting one of them too.

So there is a possibility that even if none in your family have allergies to animal dander but at no time they can develop. So what shall you do in order to stay out of this unhealthy situation? Shall you keep the dearly furry member who has now become a part of your family out of the house just for this reason? Absolutely not.

Well, you don’t have to worry about this as you can install a furnace filter in your home that is excellent in capturing as well as other allergens sneakily present at your home, providing you much a healthy air to breathe.

Buying Guide for the Best Furnace Filters For Homes With Pets in 2023

Furnace filters are efficient at capturing pet hair and other allergens from the air you breathe. In reality, pet owners will need to clean their filters more often than non-pet owners because their filters become ineffective once enough hair has been trapped.

Capturing pet fur and dander can be difficult on your HVAC machine, but there are some things you can do to lessen the effect, which will help you preserve high air quality while also reducing allergy symptoms. Now you must be convinced how important it is to have furnace filter installed in your house as it helps keep most of the allergies at bay.

If you don’t own one and thoughtful to buy it or if your old furnace filter needs to be replaced by a new one and you are thinking to purchase a brand new furnace filter then this article is perfect for you as we have tried to provide all the features as well as the price which you need to give special heed before you buy the best furnace filter for homes with pets

Features for the Best Furnace Filters For Homes With Pets in 2023


  • Fiberglass Filters:

This is a very simple, inexpensive disposable the best furnace filters for pets that prevents debris and lint from entering your furnace for about three months. Pollen, mold spores, smoke, and other smaller particles are not stopped from entering your furnace and being blown into your home by this form of filter.

  • Pleated filter:

A pleated air filter’s most obvious distinction is also it is most common. Unlike a flat fiberglass air filter, a pleated air filter doubles the amount of fabric to provide more surface space for capturing airborne contaminants. As a result, it will have a higher MERV rating, which will help to avoid further contaminants from entering your air.

Pleated filters are a low-cost, high-efficiency filter that can capture certain small particles, making them a safe choice for allergy sufferers. The extra surface area also has the added advantage of requiring less frequent replacement, saving you time and money.

  • Disposable electrostatic:

Electrostatically charged fibers attract dust, lint, and tiny particles like smoke in the air, resulting in cleaner air in your home. These electrostatic furnace filters are usually inexpensive and are recommended for households with children, pets, or smokers.

  • Permanent electrostatic:

This permanent version of the disposable electrostatic has self-charging cotton fibers that attract particles. The machine-washable, removable filter can be taken out, cleaned, and reused for up to 8 years.

  • Activated Carbon:

Activated carbon filters are one of the older types of filters, but they are still useful. Tiny absorbent pores in these filters react chemically when contaminants pass through. Pollutants and carbon bind together during this process. The additional filter collects dirt and debris while the carbon filter absorbs gases, contaminants, smoke, and even bad odors.

Note that activated carbon filters are rarely used on their own. You’ll need a second form of filter because these filters don’t kill dust or microorganisms. They work together to keep toxins out of the air.

  • HEPA:

Another great choice is HEPA, which stands for “High-Efficiency Particulate Air.” This technology was developed during WWII to eliminate radioactive dust particles that could endanger soldiers’ lives. HEPA filters are used by many home and business owners today because they can capture 99.97 percent of all airborne particles as small as 0.3 microns.

These filters have a 95% effective rate for microns as small as 0.1. Many medical professionals suggest HEPA furnace filters to patients who are allergic to allergens, dust, or debris because of their capabilities. Pet dander, dust mite debris, molds, pollen, and bacteria are all trapped by HEPA filters.

Chemicals, gases, smoke, and odors are not captured by these fi++lters, which is why you can also use an activated carbon filter. You’ll have complete coverage for all pollutants this way.

Delayed Airflow:

The blower delay is perhaps one of the most significant advancements in furnace technology. Both the fans and the burners or heating elements are turned on simultaneously in older units. This meant that cold air was forced into the atmosphere first, followed by warm air.

It’s uncomfortable to be greeted by a blast of cold air before being greeted by warm air. Warm air is blown out immediately thanks to this clever design.

Variable Speed:

The invention of the variable-speed furnace is another advancement. The fan on this model adjusts its speed as needed. As a result, the machine runs more smoothly and consumes less energy. This technical innovation is perfect for handling both hot and cold spots in a number of spaces.

Quieter Operation:

There’s no doubt that older furnaces produce a lot of noise while they’re running. If you’ve had your unit for a while, you’ll notice a significant difference when you replace it with a more modern option.

Note that a more powerful furnace uses less energy, resulting in less noise. A programmable furnace also doesn’t have to operate as hard or for as long to achieve the target temperature, which reduces annoying noise.

Correct Size:

It’s just as necessary to get the right size of the best furnace filters for pets. You’ll need whatever your heating system needs in order for it to slip in comfortably and stay put. To determine what you need to purchase, consult the paperwork that came with your new furnace or simply measure the size of the old filter. If there isn’t a size specified, measure the length, width, and thickness with a regular measuring tape.


The industry standard, according to experts, is the Minimum Efficiency Reporting Value (MERV) ranking. This is the only ranking that is classified as a federally controlled scheme. This rating was created by the American Society of Heating, Refrigeration, and Air Conditioning to identify a furnace filter ratings merv vs mpr ability to capture air pollutants and particles.

The MERV scale ranges from 1 to 20, with 20 being the highest. The higher the number, the better at catching particles the furnace filter is. However, there is one caveat: a rating of more than 13 can obstruct airflow and trigger backpressure in your system, reducing performance.

As a consequence, you’ll want to buy a high-MERV-rated filter, but only to the degree that your furnace can handle it.


The Filter Performance Rating (FPR) is a single ranking system, but it lacks figures that make it understandable. FPR uses a color-coded method to score a filter’s ability to capture specific particles and overall efficiency, in addition to a numerical scale ranging from 4 to 10.


The MPR rating, which stands for “Microparticle Output Rating,” was developed by 3M and is a reliable source. This ranking, however, is only applied to 3M and Filtrete brand best furnace filter for summer, which are both produced by 3M.

The lowest 300 MPR is a straightforward alternative that performs admirably. A furnace filter with an MPR rating of 2800, on the other hand, would be needed to trap particles as small as 1 micron.

Proper Installation:

Although some of the larger and more complicated heating units used in commercial applications require a few extra steps, the procedure is generally straightforward. An open slot is usually found near the bottom and to one side of the heating unit. All you have to do now is slide the filter inside and make sure it’s safe.

System Specifications:

Although the HEPA furnace filter is the best option for removing contaminants, many residential units are incapable of doing so. However, if you don’t choose the right filter for your HVAC machine, you risk damaging it and lowering its energy efficiency. As a result, before making an order, it’s always a good idea to double-check the manufacturer’s instructions.


You noticed a difference in when to replace filters as you read through some of the best on the market. When you buy a new filter, the manufacturer will tell you whether you should wash it or throw it away.

Lower-quality filters should be replaced every 30 days, whereas higher-quality filters will last up to six months. If you have any questions, ask a knowledgeable store clerk or look up the schedule online.

Available Price:

While considering the price of a furnace filter, you should take note of your budget. Furnace Filters are not costly enough to buy, so they generally fall within your budget. But we consider you to check other features as well rather than simply jumping onto the price factor.

We recommend you buy a high-quality bread slicer as it would serve you best in a long run. If you purchase a high-quality & the best furnace filter for summer, you can see a positive return on your investment over time. The low-cost filters, on the other hand, need regular replacement, which adds up to a large budget.

FAQs for the Best Furnace Filters For Homes With Pets in 2023

How shall I proceed to change my furnace filter?

Remember to replace your filters at the start of the heating season and at least every three months afterward. If you're having trouble with your boiler, it's always a good idea to remove the filter and inspect it for clogging. Clogged amazon furnace filters are the source of many heating repairs.

Why Do You Change Your Filter on a Regular Basis?

If the accumulated particles are left for too long, they can cause a blockage and limit airflow. As a result, the furnace starts to work overtime to drive the air in. As a result, your energy bills will rise, and your furnace will eventually break down. And this something one would least want.

Is it possible to recycle the filters from a furnace?

Despite the fact that filters are made from recyclable materials, you can never recycle one. After all, you don't want to send anyone else an old furnace filter change that's coated in dust, dirt, debris, lint, and other pollutants. Consider purchasing a reusable filter if you prefer to make environmentally friendly choices.

How to repair the furnace filter?

Replace the filter and notify a specialist right away if a clogged filter has harmed any internal components. If you seek assistance quickly, there's a fair chance the specialist will be able to make basic repairs or replacements that will save the whole device from collapsing.

What is the best way to clean a washable furnace filter?

Using a microfiber cloth to brush away any trapped dirt and debris is the simplest and most convenient way to clean a washable furnace filter. Above all, keep them clean on a regular basis. Also, wait until the freshly cleaned filter has fully dried before reinstalling it in the slot. Mold or mildew could develop if this is not done.

Which Furnace Filter Brand is Best?

Video Transcript:

Replacing that furnace filter every 30 days can get very expensive so the question is are cheap filters just as good as the more expensive ones also why bother replacing your filter when you can buy a permanent washable filter like this one we’ve got about 14 different filters to test today so let’s get the testing underway and see which filter is the best we’ll see which air filter provides the best airflow when it’s new we’ll see which air filters do the best at filtering out contamination we’ll see which provides the best airflow even after they’re dirty we’ll take a look at the filters under a microscope and compare media design in order to test hvac filters.

I built this air filter test stand the air filter will be placed at the very top of the test stand when the test begins the air filter cover is encased in plexiglass so that the contamination can easily be added to the top of the air filter air will move down and pass through an observation box that is also enclosed in Plexiglas air then travels into a six-inch air pipe at the very end of the tester is an electric fan motor that draws air through the test stand let’s establish our baseline airflow rate by first running the test stand without an air filter in place I’ll place the particle counter inside the air box the number on the left side of the screen indicates the number of the particles.

Between 1 and 5 microns in size the number on the right side indicates the number of particles at 5 microns and larger the manometer is showing static pressure which is the resistance of airflow from the filter test box into the observation box static pressure is measured in inches of water column we want this number to be as low as possible and the static pressure without an air filter is .16 inch water column so there’s very little stress on the blower motor since air is moving freely before we begin testing the filters a little more information on how filters are rated different brands use different rating systems which can cause a lot of confusion fpr npr and merv are the three rating systems.

Mir filter rating is the domestic and international industry-standard rating system established by the American society of heating refrigerating and air conditioning engineers npr stands for microparticle performance and is used by 3m fpr stands for filter performance rating and was created by home depot to differentiate their hvac filters all three rating systems can be cross-referenced for every filter we’ll be testing the filters in order from the lowest to the highest ratings most of the filters we’ll be testing are merv 8 filters since that seems to be the most common filter.

Purchased causing only a dollar eight is this aaf flanders easy flow brand which is designed to last 30 days allows more air flow than competitors model it claims it’s designed to stop up to four times more dust than the competition it’s a high airflow filter and doesn’t even have a merv rating the filter media is made of fiberglass the flanders easy flow filter is made in north carolina to test the clean filters I’ll power up the fan motor for 30 seconds the static pressure without a filter was 0.16 and it’s only up by .08 for a total of 0.24 inches of water column that’s an impressively low static pressure and will be hard to beat at 4.97 is this 3m basic filtrate brand.

Which is designed to last up to 90 days now it’s a very basic filter and is designed to stop lint and household dust it’s definitely not designed to stop dust mite debris mold spores pollen or anything smaller the 3m basic is made in Mexico the 3m basic has 14 layers of filter media, wow the filter is causing 0.27 increase in static pressure for a total of 0.43 which is very restrictive and not good why waste money on replaceable filters when you can buy a washable electrostatic filter like this one which costs 49.99 air care indoor quality specialist electrostatic air filter permanent high-tech filter never needs replacement cleaner.

Air to breathe removes pollen dust and pollutants no harmful ozone emissions made in usa the 0.38 static pressure is much better than the 3m but a little higher than desired at only 3.99 the dupont 7500 is the most affordable merv 8 filter we’ll be testing it claims it can reduce common airborne allergens in your home including 75 percent of particles from 3 to up to 10 microns in size according to the chart a merv 8 filter reduces 75 percent of airborne particles while a fiberglass filter only reduces about 20 percent the dupont filter is made in usa 14.

Layers of filter media mervate should filter out more airborne particles than the previous filters but 0.39 is still a little bit high for static pressure at 4.74 cents the true blue is the second most affordable myrovate filter we’ll be testing now it says it’s an fpr5 which is the same as a merv 8. It’s designed to stop dust lint pollen dust bite debris and even pet dander made in usa the true blue has 15 layers of filter media compared to the other merv 8 filters 0.33 is much better than the dupont’s .39 at 4.99 this aerostar brand is made in the usa.

And it’s a merv 8 rated filter the mervait has 15 layers of filter material 0.37 is better than dupont but not as good as true blue costing 5.86 is this nordic pure brand it claims your fresh air has arrived you may now breathe freely this is also a merv 8 filter made in usa 20 layers of filter material 0.38 is a little higher than desired true blue holds onto the lead for the merv 8 filters costing 5.99 is this natural ear brand it has odor eliminator with baking soda technology the other merv 8 filters only claim to handle pollen dust dust mite debris and pet dander.

But this mervate also claims to handle mold bacteria and virus carriers made in north Carolina 16 pleats 0.35 is actually pretty good but the true blue holds on to the lead at 9.08 cents this 3m filtrate is almost twice as expensive as other merv 8 filters it’s a merv 8 filter but it also uses the mpr rating which is unique to 3m three months it filters lint household dust dust mite debris mold spores and pollen this 3m filter has 15 pleats the 3m 600 actually did pretty good at 0.35 but the true blue holds on to the lead at 5.48 we’ll also be testing this 2-inch filter which is the best air brand mirv 8 ratings last up to 90 days made in USA 12 filter pleats 0.28 is a very impressive performance and the Honeywell 2 inch filter takes the lead at 22.99 is this best air honeywell.

Brand murf8 filter unlike the other ones this is a four-inch filter captures dust and lint dust mite debris mold spores pollen pet dander this filter will last up to one year made in usa 12 filter pleats wow 0.23 is the best filter we’ve tested yet the four-inch honeywell takes the lead the previous filters we tested were mervates this is a merv 11 equivalent or an mpr-1085 made by 3m filter now cost 11.97 which is more than twice as much as many of the mervate filters we tested 90 days of airflow pollen smoke particles smog particles desmite debris lint pet dander mold spores household dust this 3m filter is made in mexico 20 pleats 0.38 is a little high but not surprising since this is a merv 11 filter also costing 11.97 is this honeywell fpr7 now fpr7 is the same as a merv 11. It captures dust and lint airborne dust bite debris pollen pet dander mold.

Spores and bacteria last up to three months manufactured in usa 19 pleats .37 is a little high but not surprising since this is a merv 11 filter costing 19.97 is this 3m filtrate 1900 this is the same as a mirv 13 rating premium allergen bacteria and virus smoke smog particles cough and sneeze debris bacteria viruses last up to three months made in USA with globally sourced materials 54 plates .37 seems a little high which makes sense since this is a merv 13 filter the test stand without a filter had a static pressure of 0.16 all of the mervate filters have an asterisk next to them the mirvate 4-inch honeywell did a fantastic job at .23 easy flow 0.24 2 inch honeywell 0.28 and trueblue 0.33 to test the filtering capability of each brand I’ll take the perimeter of each filter to the test stand to ensure a good seal I’ll then spread one cup of flour across the filter and wait until the particle count stops climbing then I’ll power up the blower motor for one minute to measure.

The static pressure you can see particles raining down into the observation box the easy flow isn’t filtering much of anything the small particle count is over 22 000 and the large particle count is over 20 000 not good the static pressure was only 26, not a surprise since this filter isn’t stopping much of anything the 3m basic did a lot better at just 1400 small particles and 1100 large static pressure of 0.87 is very high and would likely cause damage to the blower motor over time the permanent filter didn’t do too well with 4100 small and 3200 large particles.

When the blower motor was activated you could see a white puff of flour entering the airbox a static pressure of 0.53 is much better than the 3m basic the dupont merv 8 filter had 3 100 small and 2400 large particles the static pressure was very high at 1.18 TrueBlue didn’t do nearly as good as the dupont at over 9000 small and 7600 large particles the static pressure of 0.95 is high but much better than the dupont the aerostar did better than a true blue at 6100 large and 5 000 small particles the aerostar also had a better static pressure of 0.74 the best of the mervate filters nordic pure did better than the aerostar at 5000 large and 4100 small particles it also had a slightly better static pressure of 0.73 the best of the mervate filters natural air didn’t do as well as the Dupont aerostar or nordic pure with 6 600 small and 5 500 large particles it really struggled with a static pressure of 1.07 the 3m600 did by far the best yet at 500 large and 400 small particles.

And as you might expect it had a very high static pressure of 1.31 the 2-inch Honeywell did even better yet at just under 300 small and around 200 large particles the static pressure was the best yet at only 0.34 showing a lot of life left in the filter the 4-inch Honeywell was almost identical to the 2-inch Honeywell at 300 small and 200 large it’s static pressure was extremely impressive at only 0.22 before adding the flour to the top of the filter the 3m mirv 11 had a particle count of 57 and 4. It did a fantastic job and did not show a particle count increase however the static pressure was high at 0.8 just like the 3m filter the Honeywell merv 11 did a fantastic job and did not show any increase in particle count however the static pressure was 1.01 which is higher than the 3m both merv 11s actually did slightly better than the 3m merv 13 which had an increase of 70 small and 50 large which is still really good what’s more impressive though is that the static pressure was only 0.52 let’s compare the large particle filtering performance of the filters.

Since the merv 8 filters are really designed to capture large particles such as dust the first three filters are merv 11s and 13 and did a very impressive job the two and a four-inch Honeywell and the 3m600 did a terrific job at cleaning the air as well while the 3m 1085 and the Honeywell both tied for first place for removing particles their static pressure was pretty high obviously one cup of flour on a 16 by 20 filter seems like an extreme test but the 3m 1900 a Merv 13 filter did very well at .52 the Honeywell 2 inch and 4-inch filters both handled the 1-inch cup of flour with ease and could easily handle more while the easy-flow filter had a terrific static pressure of 26 it did the worst job at filtering as well to better understand why the 3m 1900.

Which is a Merv 11 as well as the two and a four inch Honeywell filters did so well I disassembled all the filters and measured the length of the filter media I also took a look at each of the filters under a microscope to compare the media design 3m 1085 and the Honeywell both did a great job of filtering but only had 760 and 640 square inches of filter media respectively they obviously have a very tightly woven filter media design restricting not only dust but also airflow with such a tightly woven design and the limited surface area they can only handle so much dust load before the static pressure reaches a critical level even though the 3m 1900 which is a Merv 13 filter does have a very tightly woven filter media it overcomes the static pressure challenge by having 54 pleats and 1 560 square inches.

Which is more than twice as much as any of the other one-inch filters the service 2-inch Honeywell as well as the 4-inch Honeywell greatly benefited from having far more surface area than the competition the other filters which had much less surface area quickly became clogged and air filter that’s too restrictive just isn’t going to allow that HVAC system to properly manage temperature humidity and airflow so if you can go with a two-three or even a four-inch air filter that’s the way to go but a lot of systems just won’t accommodate anything beyond a one-inch filter so if you don’t have an issue with allergies going with a filter with a lower Merv rating and more filter plates is probably going to deliver a lot better airflow all my video ideas including this one come from viewers so if you have a video idea I hope you’ll take time to leave a comment thanks so much for watching the video please take care and look forward to next time.

What is the best furnace filter MERV rating?

When allergies aren’t a problem, MERV 8 is a decent rating for simple air filtering. When your home contains established allergens such as pet dander, mould spores, pollen, and dust, MERV 11 is a safer choice. If someone has allergies, this amazon furnace filters are the MERV rating that should be used. When there are a lot of allergens and someone in your house has allergies, MERV 13 is the best option.

How to Choose the Furnace Filter Size?

Video Transcript:

Hey Ken from an aside from the white Club guys I’m here with Scott asi training center Scott’s our tech lead technical trainer a lot of clients ask us what furnace filter do I need for my unit and that’s a very loaded question there’s a lot of furnace filters and they do a lot of different jobs, for instance, this is with what they call a one-inch pleated filter here’s a one-inch fiberglass disposable filter so we’re going to show you a couple of different scenarios and when you might use what type of filter.

So now this here is what they call a filter grill in this case here this filter drill will pull that out for you that’s a one-inch filter so if you’re going to either an 8 year HVAC supply guy or if you’re going to pull me for one of the big-box stores you’re probably going to choose a filter like this now these filters are directional so you want to be careful this filter is a little bit more efficient it’s what they call a pleated filter but you got to be really really careful and this is the danger of going to do it yourself stores there’s a lot of filters that claim that they’re allergy filters and they’re going to make you healthier but you know what drywall and plywood is probably the best filter in the world.

Because it captures 100% of particulate but you don’t move any air through it so that’s very very dangerous for your equipment and so, of course, you’ve never used those I’m only using that as to illustrate a point you gotta be careful with some of these high-efficiency filters because they may restrict your system so badly that you can damage your compressor and your air conditioner or your heat exchanger out of your furnace so now this one here you would choose a 1-inch filter now we come over here has got some pulleys that one up in this particular laminate pops off here’s a couple of different options the scats holding what they call a verb 16.

This is hospital-grade it’s a HEPA air filter hospital-grade air filtration and it has the highest efficiency rating of all the efficiency ratings this has what they call a Merv 16 rating we did another video on earth check that one out but the higher the number the more efficient it goes 1 through 16 it’s the highest efficiency and this is hospital-grade air filtration great filter unbelievable filter but again you want to have it professionally installed and be sure that you don’t damage your equipment now you see the difference on what Scott’s holding up and what I’m holding up this is Merv 8 it doesn’t have nearly as many pleats so it doesn’t capture as much.

And this will slide right into a cabinet like this so if you’ve got a filter like this and you can take advantage of a thicker better filter because even though this is thicker because of all the pleats it’s actually less resistive than a filter like this in most cases not all cases but most so you know again know what what you need to begin with do you need a thicker filter for a cabinet you need a smaller filter to fit inside of the return grille that’ll really determine which filter style you’re gonna choose and then from there you’re going to be and that’s your starting point.

Then you decide what filter is gonna be best for you are you looking for something that’ll make you healthier or are you just trying to basically keep your equipment clean okay thanks so much look forward to seeing you in our next video.

Which Furnace Filter to Buy – How Often to Change a Furnace Filter?

Video Transcript:

Before you can determine which furnace filter to buy or how often to change it it’s good to have a basic understanding of how a home heating and air conditioning system works forced air heating and cooling systems distribute heated or cooled air throughout a home using supply and return ductwork the ductwork is connected to supply registers and return air grills when the system’s blower fan runs it pulls air through return air grills through the return ductwork through the filter by the fan through the heat exchanger which heats the air or the evaporator.

Core to cool the air depending on the season and into the supply ductwork through the supply registers and then back into the return ductwork to repeat the process the filter is a very important part of the cycle I tested the performance of three filters by measuring the temperature just the evaporator coil before I show the test results let’s spend a little time talking about filters next to the blower will be the return air ductwork and when some systems you may find a return air grille and a ceiling that has a filter behind it there’ll be a slot in this location.

Where the filter is placed somewhere on the filter you’ll find an error that indicates the direction of airflow insert the filter in the slot so that the arrow points towards the blower the industry-standard two rate filters are called merv the ratings range from 1 to 20 the higher the number the smaller the size of particles that are blocked and the more restrictive the filters rated 12 and above are mostly found in clean rooms in hospitals at a lot of work around clean rooms these clean rooms had powerful fans that we’re able to push air through the dense.

Filters and the fans constantly ran to clean the air ratings went through 11 are typically found in household systems this is a merv 2 filter just a flat panel and sort of transparent this is a merv 8 filter the material is denser it’s more restrictive and will trap smaller and more particles than the merv – the filter is pleated if we were to flatten this out there would be more surface area and the theory is that the more surface area will compensate for the denser more restrictive filter material the primary purpose of the filter is to keep dirt and debris from collecting on the blower fan fins making it inefficient and from keeping dirt and debris from collecting on the equipment beyond the blower causing restriction dirt that collects on the evaporator coil insulates it and makes the coin system less efficient recently there’s a trend to design filters with the thought of improving the indoor air quality inside a home.

Here are the tumor 8 filters I’ll be testing this one was in place for about three months and this is the clean filter these are just generic filters I paid four or five dollars apiece for them the first filter to test is the dirty merv 8 I’m choosing to use temperature to test the filter if you were to contact your service company that takes care of your furnace they would likely use a manometer and they would check the pressure job on either side of the filter printed on most filters you’ll find the pressure drop at different fan speeds this will be key to purchasing the correct filter for your furnace a measure the temperature by inserting the sensor into the supply duct just above the evaporator coil the furnace has been running for 15 minutes the temperature probe is in the supply side ductwork and the temperature is stabilized at one 48.6 and next to the clean merv 8.

And it’s stabilized at one forty-three point six and last the clean merv to the supply duct temperature is 141 points four we can conclude that as filters get dirty they become more restrictive in that some filters are more restrictive than others restriction slows down airflow in slower airflow increases the temperature at the heat exchanger prolonged high temperatures can cause the heat exchanger to crack prematurely and usually the cheapest repair is to replace the furnace slow airflow over the evaporator coil during the coining season can cause the coil to freeze up and possibly damage the compressor installing a filter that is too restrictive for your systems fan speed or not changing the filter often can be costly the key to selecting the filter that won’t damage your system or cause the fans to work harder and waste energy is to know the fan speed for your system.

This plate is located inside the furnace notice that the maximum static pressure is 0.5 measured in the water column the rule of thumb is that the restriction of the filter should be no more than 20% of this number that’s point one for this furnace printed on better quality filters you’ll find a chart it’ll show the merv rating you’ll also find a chart that shows how much resistance the filter has at various fan speeds the top row shows various fan speeds measured using cfm the bottom row shows resistance in the water column if the fan speed for heating was 850 cfm then a clean filter would have point zero nine water column resistance and let’s say for cooling the fan speed was a thousand cfm then the resistance would be 0.1 three so this merv to filter would max out the twenty percent target here’s.

A label from a murphy 11 filter and at eight hundred twenty cfm you’d be using up fifty percent of the maximum static pressure for this furnace for the question of how often to change a filter that can depend upon the conditions within your home the simplest thing to do is to monitor it and when it starts to become this color to change it if you’ve got a lot of time on your hands you could buy a manometer check the pressure drop on either side of the filter as it gets dirty and change it when the pressure drop becomes too high I hope you find this video helpful a thumbs up is always appreciated click on the channel name know-how now to find other videos and thanks for watching.


We understand how difficult it would have been to choose which model furnace filter will be better for your home. Especially with the variety of options available in the market.  However, you must carefully read the buyer’s guide to ensure that you make the best decision.

After all, putting in a little time to find the right & the best furnace filters for pets will help you save a lot of money.  It also aids in the protection of indoor air quality. So, what do you have to lose? But instead much to gain.

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