Biodefensor Reusable Air Filter 20x30x1, Made in USA - Cut to Fit Most Furnace, AC, HVAC Vent - Washable, Durable, Rigid Media - High Airflow Energy-Efficient, Includes Prep Pad & Hook Tape

Making a simple tray in the air duct return it appears to be working great. The ability to wash the filter will make this a money saver.

This is a good quality washable, high-flow prefilter. At MERV 6, it cuts our larger airborne particles without really affecting flow pressure (your fan won't have to work significantly harder), saving your main filter to trap smaller irritants - and even with a HEPA filter at the furnace intake already, I'm seeing an improvement in air quality after a week of adding these filters to my cold air return vents.I can't speak to longevity yet, but they feel solid cutting the material and fitting it in my vent registers (there's a nice amount of spring, so if you're using this in old-school registers that are not designed for filters as I am, you can cut the pads slightly larger than necessary and they will compression-fit themselves to help block edge gaps), and they held together through a test washing I did, so the initial material quality seems good.I will strongly recommend everyone with an old forced air system do what I did and add prefilters of some kind to the return vents. Go high-flow for the prefilters and get a high-MERV HEPA for the main filter, and improve your life along with your home air quality.

Perfect fit for my furnace and the best quality filter I have seen.

I thought I was getting two filters. I now realize it was one bigger one folded in half in the picture. Not a problem, just an oversight. I probably wouldn't have purchased it though, due to the price of one.

I could not get a new filter for this vacuum because they quit making them a very long time ago. I kept looking for something that would work and could not find anything. The original filter was incased in plastic and had to be a certain size to fit. When I saw this, I knew it would work and it does!! Of course it is was way too big and I certainly didn't need that much, but I cut it and it fits perfect! I only wish I could have bought a smaller size at a cheaper price, but I will probably toss it after so many washes and just cut a new one. Could come in handy for something else someday too.

We bought these for our new furnace since the installer of the furnace recommended using this type of filter in it instead of the usual paper ones. They are very nice and seem to keep the dust down. They are easy to clean. Depending on the season, I either spray them with a hose outside or put them in the shower and spray them off. I bought a couple of them so that when one is dirty I have the other one to use while the dirty one is being washed and dried. I would recommend them to anyone looking for a reusable filter.

I’ve used lots of different brands over the years, and these are the best quality of any. You can’t see through them like you can some others, and when you clean them, you can tell just how substantial they are because the water doesn’t just shoot right through them. Get the two pack so you have one to use while the other one dries after you clean it.

This is the BEST air filter I've ever had. I bought one a couple of years ago and am so impressed with it, I bought another one the other day. They are easy to cut down. I have mine in a filter frame and when it's time to clean it, I use my handheld shower head and run water through it until the water runs clear. Air moves easily through the filter even when it's time to clean it. It is lightweight, yet very sturdy. After cleaning the filter I let it drain for a couple of hours then I tap it to get those little water bubbles out and it dries overnight. I bought the second one so I can pop it into the cold air return without waiting for the other one to dry. This has been one of the best investments...no more disposable filters.