Allergyzone Azfl 100 Filter Lock Air Filter Slot Door Cover. Is re-usable and extremely durable. Eliminate air leakage in HVAC system to help reduce utility bills and save energy.
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Account Lists Returns Orders. FilterLock by AllergyZone stops dirty unfiltered air from entering your home through an open or poorly sealed air filter slotdoor on your heating and air conditioning system HVAC. AllergyZone AZFL-100 FilterLock Furnace Filter Slot Seal Door Cover. Improve indoor air quality by blocking allergens dust and gases like carbon monoxide from entering your home.