They are air conditioner filters, they work very well.

I have these for years get moore for my money

Love the four pack for the price.

Check actual opening size. These were slightly too big and very hard too fit the opening.

Loved these filters as they hwlp with viruses and bacteria.

Great filters for a great price. Filtrete is the only brand that I buy.

These work really well. The price is also a plus.

This is the second time, I’ve purchased these filters. These are great!

Great ac filters ; can buy in quantity;

Filtrete is the ONLY brand I buy and I highly recommend vs other brands