20 Best 16x22x1 Air Filter [2024]

Are you looking for the best 16x22x1 Air Filter? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling 16x22x1 Air Filter.

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1 Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters...
2 Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters...
3 Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (6-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (6-Pack), Pleated HVAC AC Furnace Air Filters...
4 Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air...
5 Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (6-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (6-Pack), Pleated HVAC AC Furnace Air...
6 Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air...
7 Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air...
8 Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (12-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (12-Pack), Pleated HVAC AC Furnace Air Filters...
9 Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (3-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (3-Pack), Pleated HVAC AC Furnace Air Filters...
10 Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (5-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (5-Pack), Pleated HVAC AC Furnace Air Filters...
11 Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air...
12 Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air...
13 Aerostar 16 1/2 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size:... Aerostar 16 1/2 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual...
14 Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size:... Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual...
15 Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size:... Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual...
16 Filtrete 16x20x1, AC Furnace Air Filter, MPR 300, Clean Living Basic Dust, 6-Pack (exact dimensions... Filtrete 16x20x1, AC Furnace Air Filter, MPR 300, Clean Living Basic Dust, 6-Pack (exact...
17 Filtrete 16x20x1, AC Furnace Air Filter MPR 1000 MERV 11, Allergen Defense, 2-Pack (exact dimensions... Filtrete 16x20x1, AC Furnace Air Filter MPR 1000 MERV 11, Allergen Defense, 2-Pack (exact...
18 Aerostar 16 3/8 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size:... Aerostar 16 3/8 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual...
19 Filterbuy 16x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters... Filterbuy 16x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters...
20 Aerostar 16 3/8 x 21 1/2 x 1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size:... Aerostar 16 3/8 x 21 1/2 x 1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual...
Bestseller No. 1
Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 2
Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 3
Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (6-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 4
Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 5
Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (6-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 6
Filterbuy 16x22x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 7
Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 8
Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (12-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 9
Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (3-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 10
Filterbuy 16x22x1 Air Filter MERV 8 Dust Defense (5-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 11
Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 12
Filterbuy 16x22x1 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x22x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 16.00" x 22.00" x 1.00")
  • MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
SaleBestseller No. 13
Aerostar 16 1/2 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size:...
  • Nominal size: 16 1/2x21 1/2x1; Actual size: 16 1/2"x21 1/2"x3/4"; This MERV 8 filter is comparable with MPR 600 & FPR 5.
  • Designed to filter microscopic particles such as lint, dust mites, spores, and pollen
  • Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but...
  • 100% synthetic electrostatic media for high efficiency with low air flow resistance
  • Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more...
SaleBestseller No. 14
Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size:...
  • Nominal size: 16 3/8x21 1/2x1; Actual size: 16 3/8"x21 1/2"x3/4"; This MERV 11 filter is comparable with MPR 1000-1200 & FPR 7.
  • Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke
  • Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but...
  • 100% synthetic electrostatic media for high efficiency with low air flow resistance
  • Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more...
Bestseller No. 15
Aerostar 16 3/8 x 21 1/2 x 1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size:...
  • Nominal size: 16 3/8x21 1/2x1; Actual size: 16 3/8"x21 1/2"x3/4"; This MERV 11 filter is comparable with MPR 1000-1200 & FPR 7
  • Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke
  • Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but...
  • 100% synthetic electrostatic media for high efficiency with low air flow resistance
  • Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more...
SaleBestseller No. 16
Filtrete 16x20x1, AC Furnace Air Filter, MPR 300, Clean Living Basic Dust, 6-Pack (exact dimensions...
  • OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. air filters for your furnace, air conditioner or HVAC system
  • DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through
  • ATTRACTS AND CAPTURES large particles such as lint, household dust and dust mite debris
  • MPR 300 has a rating of MERV 5
  • The higher the MPR, the more microparticles - such as pollen, pet dander and smoke - your filter will capture from the air passing through it
Bestseller No. 17
Filtrete 16x20x1, AC Furnace Air Filter MPR 1000 MERV 11, Allergen Defense, 2-Pack (exact dimensions...
  • OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system
  • DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through
  • ATTRACTS AND CAPTURES particles such as lint, pollen, dust, pet dander, smoke and smog
  • 1000 MPR has a rating of MERV 11
  • The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing...
Bestseller No. 18
Aerostar 16 3/8 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size:...
  • Nominal size: 16 3/8x21 1/2x1; Actual size: 16 3/8"x21 1/2"x3/4"; This MERV 8 filter is comparable with MPR 600 & FPR 5.
  • Designed to filter microscopic particles such as lint, dust mites, spores, and pollen
  • Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but...
  • 100% synthetic electrostatic media for high efficiency with low air flow resistance
  • Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more...
Bestseller No. 19
Filterbuy 16x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters...
  • 16x20x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 15.50" x 19.50" x 0.75")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without...
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products...
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 20
Aerostar 16 3/8 x 21 1/2 x 1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size:...
  • Nominal size: 16 3/8x21 1/2x1; Actual size: 16 3/8"x21 1/2"x3/4"; This MERV 13 filter is comparable with MPR 1500-1900 & FPR 10.
  • Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, smoke, viruses, and bacteria
  • Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but...
  • 100% synthetic electrostatic media for high efficiency with low air flow resistance
  • Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more...

Having trouble finding a great 16x22x1 Air Filter?

This problem is well understood by us because we have gone through the entire 16x22x1 Air Filter research process ourselves, which is why we have put together a comprehensive list of the best 16x22x1 Air Filters available in the market today.

After hours of searching and using all the models on the market, we have found the best 16x22x1 Air Filter for 2023. See our ranking below!

How Do You Buy The Best 16x22x1 Air Filter?

Do you get stressed out thinking about shopping for a great 16x22x1 Air Filter? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching 16x22x1 Air Filter, which is why we have assembled a comprehensive list of the greatest 16x22x1 Air Filter available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 16x22x1 Air Filter that you consider buying. Your questions might include the following:

  • Is it worth buying an 16x22x1 Air Filter?
  • What benefits are there with buying an 16x22x1 Air Filter?
  • What factors deserve consideration when shopping for an effective 16x22x1 Air Filter?
  • Why is it crucial to invest in any 16x22x1 Air Filter, much less the best one?
  • Which 16x22x1 Air Filter are good in the current market?
  • Where can you find information like this about 16x22x1 Air Filter?

We’re convinced that you likely have far more questions than just these regarding 16x22x1 Air Filter, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for 16x22x1 Air Filter, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible 16x22x1 Air Filter. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an 16x22x1 Air Filter buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available 16x22x1 Air Filter currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of 16x22x1 Air Filter has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an 16x22x1 Air Filter?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your 16x22x1 Air Filter.
  5. Customer Ratings: Number ratings grade 16x22x1 Air Filter objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 16x22x1 Air Filter.
  7. Product Quality: You don’t always get what you pay for with an 16x22x1 Air Filter, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 16x22x1 Air Filter is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining 16x22x1 Air Filter information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding 16x22x1 Air Filter is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What is the best air filter for home?

A: The Best Mattress: Helix Midnight LUXE Mattress The Best Mattress Topper: Coop Home Goods Flip Mattress Topper The Best Pillow: Fluff Co. … The Best Comforter: Riley White Goose Down Comforter The Best Cooling Sheets: My Sheets Rock “The Regulator” Sheets The Best Linen Sheets: Greyleigh Hilma Linen Sheet Set

Q: Where is the air filter on a furnace?

A: – Q1. How can I buy from Xiamen R&J Filtration Co., Ltd.? – Q2. What is the average response time? – Q3. What kind of warranty do you offer? – Q4. What kind of payment modes do you accept? – Q5. How long does it take for Xiamen R&J Filtration Co., Ltd. to deliver the shipment? – Q6. What kind of packaging do you offer?

Q: What does a furnace air filter do?

A: The primary function of your furnace filter is simply to remove particles from the air moving through your ductwork. This particle clearance protects your furnace’s blower fan and air conditioner, as well as you (by preventing the recirculation of the contaminants into the air you breathe).