Filtrete 20x25x1 AC Furnace Air Filter, MERV 13, MPR 1900, Premium Allergen, Bacteria & Virus Filter, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4-Pack (Actual Size 19.69x24.69x0.78 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.

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.

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.

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

My use was possibly a unique, I was looking to make a large whole room high particulate filter inexpensively. For my use, I take 4 of these and using duct tape, I seal the edges of each to make a 20x20x20 box, I used the actual brown box to cut a flat bottom and then tape a ordinary house box fan taped (and sealed) facing upwards to pull all the air into the filters in the room and fresh clean air out. These work great if working in a confined space like a garage or barn with lots of dust like cutting wood. Thes worked perfectly with a box fan and duct tape, better then the most expensive store bought filter.

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.

Good filters traps alot of airborne crap

EXCELLENT 3 month filter. Live in an apartment complex with a stand along HVAC system and they don't clean the furnace yearly, therefore alot of dust and debris. This filter really helps with that and also helps with noise reduction.

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