K&N 20x20x1 HVAC Furnace Air Filter, Lasts a Lifetime, Washable, Merv 11, the Last HVAC Filter You Will Ever Buy, Breathe Safely

4.67 out of 5
(10 customer reviews)


Brand K&N
Material Synthetic Polymer (PMMA)
Product Dimensions 19.6″L x 19.6″W x 0.8″Th
MERV Rating 11
Compatible Devices Air Conditioner, HVAC System, Furnace

  • The LAST AIR FILTER YOU WILL EVER BUY: Washable furnace filter for long-term home HVAC filter savings
  • SAVE MONEY: Save $30 annually with reusable air filter compared to disposable, one time use filters
  • INCREASE HVAC EFFICIENCY: Excellent airflow to help maintain HVAC system efficiency
  • GUARNATEED QUALITY: Premium design and construction for excellent air filtration
  • DIRECT REPLACEMENT: Designed to fit directly into your filter register
  • IMPROVES AIR QUALITY: Helps capture dust, pollen, and other contaminants
  • MERV 11: Superior Filtration
  • EASY TO CLEAN: Remove filter, apply K&N HVAC filter cleaner, rinse with low pressure hose, let filter dry, return filter to housing


From the manufacturer


K&N Heating, Ventilation, and Air Conditioning Air Filters

Since 1969, K&N has been inventing and manufacturing creative air filtration solutions for the automotive market. Now that expertise has been brought into the home, with K&N’s new washable, reusable HVAC air filter. Made from a pleated synthetic filter media, K&N lifetime washable home air filters provide excellent filtration and dust capacity for long-life performance. They are specially designed to reduce contaminants in the air you breathe—and can be cleaned easily for years of use in your home, office, or business. Instead of repeatedly purchasing new disposable filters, simply wash and reinstall your K&N filter whenever it is dirty. Save money, help the environment, and protect your family with K&N!

K&N HVAC Air FIlter Benefits

Clean Air


Easy Installation

Helps Improve Air Quality

You may not realize that the air inside your home can be even dirtier than the air outside in the environment, and a high-quality HVAC filter can help improve the quality of the air that you breathe!

Helps Increase HVAC Efficiency

High airflow helps reduce HVAC system strain and requires less energy, which can translate to savings for you! When a filter becomes extremely clogged, airflow through the filter begins to slow, which can force an HVAC system to work harder to compensate.

Direct Replacement Durable And Built To Last

Each K&N lifetime washable home air filter is designed to fit directly into your HVAC filter housing just as easily as a typical disposable HVAC air filter, with multiple dimensions and sizes available for easy installation.

K&N HVAC Air FIlter Maintaince


Spray Cleaner

Rinse Clean

Durable And Built To Last

K&N lifetime washable home air filters are guaranteed to last—with a durable frame constructed of extruded ABS polymer, and a washable synthetic air filter media designed to be cleaned and reused as often as necessary to maintain high airflow.

Easy to Clean

Washing your K&N lifetime washable home air filter is as simple as removing your filter from its housing, spraying on K&N HVAC filter cleaner (part no. 99-6010).

Washable & Resuable

Rinsing with a low-pressure hose! After your filter is dry, simply reinstall to enjoy the benefits of K&N’s industry-leading washable filtration technology. See the full instructions included with your filter for details.

Additional information

Dimensions 19.6 × 0.8 in
Part Number


Item Weight

‎0.01 ounces

Product Dimensions

‎19.6 x 19.6 x 0.8 inches

Country of Origin


Item model number







‎Synthetic Polymer (PMMA)


‎Air Filter

Item Package Quantity


Included Components

‎HVAC Filter

Batteries Required?


Warranty Description

‎Limited Lifetime



Date First Available

March 1, 2019


‎K&N Engineering, Inc.

10 reviews for K&N 20x20x1 HVAC Furnace Air Filter, Lasts a Lifetime, Washable, Merv 11, the Last HVAC Filter You Will Ever Buy, Breathe Safely

  1. 5 out of 5

    Doug E

    K&N qualityI have used K&N for automotive uses until I found this!! No more buying expensive toss away furnace filters!!! The MERV rating is fine for three adults and a dog all under one roof. No odors or dust issues either.

  2. 5 out of 5


    I’ll love it if it matches the descriptionI just installed this on 4/1, so I can use the first of the month as my monthly cleaning marker. This is so much more sturdy than any of the 3-month filters I’ve used for the past 5 years The durability remains to be seen.

  3. 5 out of 5


    Glad 2 see K&N in the home filter MarketSo far everything is good to go. I’ll update my review after my first cleaning. If I can 2yrs out of this it’ll be worth the money.

  4. 5 out of 5

    Michael & Charlene Henderson

    The absolute best home item. Save $$$$$This is awesome. Always use this filter in all my cars.. always!Then I find out I San get one for my home.This will save us hundreds if not thousands over its lifetime. It just requires some K and N cleaning juice and bam back into place to filter your air out again. My house has less lint, dust, and needs less cleaning my furniture which means less of my time so I can do other things like leave this review. LolGood day,Mr2

  5. 4 out of 5


    Still deciding if it is worth the workI have had this filter for over 6 months. I have cleaned it twice. I use K&N air filters on my bike, so thought I would try it for the house. As this is large, it does take some effort to clean. I guess, in the long run, I will save money, but don’t think all the extra work is worth it. Just my two cents.

  6. 4 out of 5


    Seems to work betterBought this to replace monthly disposables. After one month this filter still looks clean thinking it might need cleaning less often than expected. A bit pricey at first but will eventually pay for itself and save money.

  7. 5 out of 5

    Walter Clark


  8. 5 out of 5

    Michael P horton

    They need anti rattle block added .I love k&n filters this one they need a block the can squeeze at top to hold filter so it don’t rattle when HVAC starts besides the rattle I have no complaintsPs I added stirfoam peice to stop rattle on mine.

  9. 4 out of 5

    Mark W.

    Had to cut to fitThe filter really should work well. Washed it twice so far but wasn’t all that dusty. Was an inch too long on the short side but was able to cut the frame and the inside filter just right. Takes some skill not recommended for everyone. Since the edge had a felt type flat lining I simply overlapped the extra and fits great. My only concern is a warning that the filter causes back pressure on the filtered side which might cause the furnace fan to overheat. Not sure if this is an issue since the furnace fan doesn’t slow down at all. If a motor slows then current goes up on the windings which causes them to get warmer or even hot enough to melt. Motors are designed to run at a certain RPM and FLA but there is some tollerance. All the vents blow the same as far as I can tell. The fan will cause a slight vaccum between the fan and the filter and lesser motors will slow slightly possibly but I have no way to find that out. I have a two speed capacitor start and keep it on slow speed even when the thermostat is on fan setting. Normally that makes the motor go to high speed. I am a licenced electrician so wired the motor not to go to high speed. Put my hand on the motor squirrel cage after a cycle and it wasn’t hot at all, barely warm. Right now 2 months and no problems. I’ll update in a few months if AMAZON allows that sort of thing.to keep ya’ll posted.😎

  10. 5 out of 5

    Guy boiteau

    Great filterGreat filter works wonderful,

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