20x20x1 MERV 13 Pleated Furnace Filter · 1-Pack – ClearFit

20x20x1 MERV 13 pleated furnace filter for residential HVAC systems — actual size 19-1/2 x 19-1/2 x 3/4 in (nominal sizes run about half an inch larger, so measure your slot before ordering). Pleated synthetic media captures microscopic particles, smoke, and bacteria/virus carriers; replace every 90 days. The green frame shown in the photo marks this as our MERV 13 high-capture media. Ships from Indiana with our 100% fit guarantee: if it doesn’t fit your filter slot, we replace it or refund you.