change mine out every month - these are fabulous

Having backup filters is such a great idea.

Great quality filters that last up to 90 days and the price is amazing on them great for allergies

Great value for the money. They are good quality.

A I alway purchase these filters as they work as advertised!!

These filters really helped keep the in-house air cleaner when experiencing seasonal allergies.

Great purchase. These filters are very good quality.

Best deal ever for filters

Great product at a very consumer price!

Appears to be functioning as expected.