Fiberglass Furnace Filters sometimes referred to as Basic Furnace Filters are designed to protect your system. Fiberglass filters will help to capture the larger particles you can see with the naked eye and should be changed about every 30 days. All of the Fiberglass Furnace Filters and Air Conditioner Filters we sell on RememberTheFilter.com are available in packs of 12 air filters. All of the fiberglass filters below can be used in both furnace and air conditioners, and in both commercial and residential applications.
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