Results 1 - 48 of over 1000 · Filterbuy 10x30x1 MERV 8 Dust Defense air filter (pack of 6), pleated HVAC AC. Only 2 left in stock, order soon! It is determined by testing the performance of a filter when exposed to particles of a known size in the air stream. Discount Filters offers many different types of air filters at a discount to help you breathe better the air inside your home based on your specific needs. A dirty filter restricts air flow to the system's air controller, making it work harder to cool or heat the house.
A dirty, clogged filter can restrict air flow from the oven or air conditioner and potentially cause problems with the system.