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Furnace air filter slot cover.
Improve indoor air quality by blocking allergens dust and gases like carbon monoxide from entering your home.
It improves indoor air quality by blocking allergens dust and gases like carbon monoxide from entering your home.
Two piece design works with any 1 inch furnace filter up to 25 inches long.
See below for our affiliate link to the filterlock furnace filter slot seal door cover.
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By sealing your furnace and ac filter slots you block allergens and contaminates from getting into your duct system.
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Furnace filter slot cover that is an easy fix to hvac air leaks.
Filterlock seals furnace and air conditioning air filter slots to reduce utility bills and improve indoor air quality.
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Magnetically attaches to duct work to cover furnace filter slot door.