These work well and last 2-3 months (we have 2 labs).

Very good quality air filters

I use these in my open windows behind fans to clean the air as the fans draw in fresh air into the house.

Have used these for years and very satisfied with them. Always try to take advantage when Sam's has them on sale

got these on sale now I am set for the year I don't have to worry about running out to get a filter. I am happy about the purchase

These are the filters I always buy and they work well. Sam's had the best price that I found for Qty. of 4.

Well built, sturdy. Obviously the consumer has no way of measuring the actual filtering capability.

Does a great job of collecting all the dust & gunk in the air. I change it out every 3 months & it's nealy brown & gray with dirty lint.

These are fantastic. It seems to be an odd size and somewhat hard to find in the stores. I have been using these for the last three years, changing them quarterly and I am always amazed how much dust they collect.

Have been using about a month and have noticed a big difference in air/room quality cleanliness. Aggravated allergy levels have dropped noticeably as well. Glad I purchased.