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

My furnace has two 1 filter slots Should I use both slots? furnace filter slot cover An HVAC professional can retrofit such a filter to your current ductwork if you don't already have a slot that can hold a 4-inch filter furnace filter slot FilterLock · Filter Products · Filter-Monster · AllergyZone FilterLock Furnace Filter Slot Seal

furnace filter slot Even though it's sized correctly, we still cover the filter perimeter with blue painters tape Lots of air would find its way around the filter

what are the chances of winning a slot machine Sometimes the sheet metal is formed into a slot so that the sheet metal cover that ought to go in there can be slid into place Other times Return Grill covering for furnace filter If you don't have an existing filter, measure the filter slot or frame in your furnace