K&N 20x20x1 HVAC Furnace Air Filter, Lasts a Lifetime, Washable, Merv 11, the Last HVAC Filter You Will Ever Buy, Breathe Safely at Home or in the Office, HVC-12020

I've slowly replaced every filter-based system with these K&N Home filters. HVAC? Replaced. PC? You betcha, I replaced a side panel on my Lian Li O11 Dynamic with one and can now run a positive pressure system, so dust can't get in .. so nice (if you're curious, I selected that beefy case just for this as the extra width and internal 3x120fan bay allow for this type of filtration once you seal up the inner-wall). Home Theater cabinet? Yep! Air purifier? I jerry-rigged that too and so far, my neighbor hasn't noticed his box fan missing.Are they a tad expensive? Yeah, but the amount of use you're getting out of them is pretty high and they come in cheaper than many of the other "washable" aluminum filters. Out of all "washable" filters I've tried, these function pretty dang well -- and cleaning is a synch. No, you don't need their filter cleaner, you can use some diluted degreaser (dishwashing soap works) in a spray bottle, spray that on, and let it soak, then wash it out (opposite of the airflow, so the dust collecting side is down). Use a flashlight or ceiling light to see through to gauge the cleanliness, more light = more clean .. science!But let's talk fit and performance.Fit:- They're a tad undersized, so you'll want to get some gasket material to make sure you get a good seal.- They come in only (at the moment) 1x# sizes (more like 3/4"), but I hope they will introduce 2" and 3" sooner than later.Performance:- Air flow is surprisingly high with these, higher than a normal comparable fabric/paper filter, and way higher than one rated at this spec.- They have a very high pleat count, so that maximizes the surface area to allow for better airflow.- Static pressure was also better in comparison during my tests.- My HVAC blower got "quieter" running 1x25" filters versus the 2x25" disposable fabric-based ones I had in it before.- Be cognizant to keep them maintained and washed for best performance.I haven't finished my round of additional testing (lack the right meter) to see the particle size that gets through these, but I will say that since switching to them about 6 months back, all I find in the house is a very fine dust -- I'm planning additional tests to see if that is just residual dust in the system (~16 years worth) that is working free.

I am a maintainer on electronic equipment as an occupation and most electric equipment cabinets have metal, reusable filters. Shortly after purchasing my house I figured they'd have the same for HVAC purposes. Low and behold they do and it works. Make sure to not let these get rusty and try to use a plastic vacuum tip on it as metal tips can damage these.This saves money in the long run, is less of a headache, and is more environmental friendly. I highly recommend these over disposable filters. I have bought different brands to fit different sized air intakes and filters in my home. They all function similarly. This has sturdy construction and I look forward to not needing to replace this hopefully ever.

Had saved us a lot of money. We have 4 dogs and needed to replace our air filter every month no matter the rating. This has helped us save so much money. Cleaning is easy and seems to work just fine.

I have bought K&N filters for my motorcycles and cars for 30 years. I know the high quality.Wife found these for our house AC (20x20) and bought. She also got the cleaning spray.We have two air returns so she got two. We gave them a month and then took out and cleaned per instruction.Cleaned up great. Even sheds cat hair along with the dust.She bought two more so we can swap out sets and give the dry time. (Not really needed).She has been buying the high dollar one-time filters for several years,,, throwing them out every few months.I expect this to save us big on filters,,,, if they last just a few years each.And much better than the old Electrastatic Filter Paul Harvey sold us 30 years ago! lolGOOD REUSE FILTERS, THANKS K&N.

The air filter work well it is hard to clean all the dust off it and I purchased the K and N cleaner as well and it still dos t get all the dust off

Fit perfect and the filter quality was worth the money. Its improved air quality with its dust removal and functionality. Must buy. One and you are done beside cleaning once a month