Upgrade Furnace Filter Size 16x25x1 to 16x25x4

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Furnace filter slot cover that is an easy fix to HVAC air leaks Here's the link to AllergyZone

What does furnace air flow have to do with which way the furnace filter goes? Draw an arrow with a permanent marker near the filter slot that

furnace filter slot Any Household HVAC System $ 15 in stock at Fitchburg, MA Aisle 13, Bay 14, Slot 80 True Blue 116201 Air Filter, 20 in L, 16 in W, 2 MERV Add SKU:

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