1 In Filterlock Furnace Filter Slot for HVAC Filters

If you have a 2” or a 4” filter slot, using a filter with a higher Merv rating will be less of a concern, as the higher surface area of a thicker filter causes

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 cover Dumb idea #1: Put a series of machine screws along the duct opposite of the filter slot The filter should push against them when air is flowing

sakti77 slot Furnace filter slot cover that is an easy fix to HVAC air leaks Here's the link to AllergyZone