My furnace has two 1 filter slots Should I use both slots?

furnace filter slot cover   Dan furnace filter slot cover

Add a comment 2:19 Go to channel · Why Does The Furnace NOT Come With A Filter Slot

=youtube&cm_mmc=Social-_-Youtube-_-ProductVideo-_-809423 Filter Monster FilterLock If you can't find a filter slot on your HVAC unit, try looking in the vents that blow air into your rooms Some systems have filters in the return air vents

slot chip gratis AllergyZone - FilterLock Filter Slot Seal – Seal Cover for Any 1” Furnace Filter, Up To 25” Long Protect Your HVAC System: FilterLock is a patented The issue is an open furnace filter slot In other words, the slot has no cover and you can see the spine of the filter A quick look at