Furnace Filter Cover?

Is it a problem that my furnace filter is loose in its slot? filter slot cover PCI Slot Filter Made by high-quality hard steel this PCI slot features optimized openings and a removable dust filter for easy cleaning 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

shaolins tiger slot Filter Lock Furnace Filter Slot Seal by Allergy Zone is a patented, one-size-fits-all product that covers the filter slotdoor to prevent entry of