20x25x1 Air Filter, MERV 13 MPR 1900, Allergens, Bacteria, Viruses & Air Pollutants, 3-Month AC/Furnace Filters, Cleaner Air Reliable Airflow, 4 HVAC Filters(Act Size 19.62x24.62x0.78 in)

I use these filters in sets of four for my DIY Corsi-Rosenthal style air purifier (just search online for “DIY air purifier”). The filters are very efficient and last longer than their cheaper and flimsier counterparts. These are much more expensive at the big box stores but often go “on sale” on Amazon. When they do, I stock up.

Exactly what I ordered and arrived quickly and well packaged. No damage. This size fits my furnace perfectly and are easy to install. These 1900's really reduce allergens and keep our air clean. They are sturdy and help seal the furnace from unwanted dust and other nasty bacteria. I got these for a good price and will purchase again.

Each filter sealed up,great

I find these filters work just as described by the seller. They are easy to Install. With good airflow. And clean the air.

Four stars for meeting all requirements. Doesn't _exceed_ expectations, so it doesn't get the fifth star. This package of four filters, plus cardboard pieces cut from the box, plus a fan, plus some tape to seal edges, yields a highly effective and moderately portable room air filter. Corsi-Rosenthal boxes were developed during the COVID-19 "plague years", and can be surprisingly effective. Even if you don't need it for removing virus particles from the air, filtering can reduce allergens and other indoor pollutants. Or, of course, you could get these for their intended use as furnace air filters. In that application the manufacturer suggests replacing them every three months, so this is a year's supply.

Less expensive than buying at Home Depot or at Lowe's. It works like every other Filter.

I have always used these after getting our new AC unit. There is a difference and you can tell when you change them out and see all the dust they collect.

I changed my filter every 3 months. Last time I tried to rebuy the previous product of the same size but it was off the market. Now I found gold! It fits perfectly to my old AC vendor! Thank you!

My wife and I have been using these filters and they are great quality. We got it a great price and highly recommend

The filters were the perfect size to create a a diy room air filtration system along the lines of a Corsi Rosenthal box (google it). Great product and just what I wanted

Très bon produit. De plus, un malentendu sur la commande a été promptement corrigé par le fournisseur, à ma très grande satisfaction.

Muy buenos

Product came damaged ended up returning it