Lasts up to 3 months but have to change every month.

Probably overkill rating unless you have hairy pets that shed & dusty environment.

These are high quality furnace filters, and the price for a four-pack was excellent.

Great filter at a good price

Great value for the price

Great price for an excellent product. Arrived quickly.

Good filters at reasonable price.

Love the filters.....MUCH better than the "monthly" ones!! Definitely worth the money!

Definitely the best ones to use if you have a compromised immune system.

These filters are great at clearing dust & other particles in the air.