20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 4 Pack lighting-&-electrical-components Two square obeservation windows on

Two square obeservation windows on the front door

so you will not introduce diseases into the garden or greenhouse

Duct Opening Diameter: 6 inches | Front Plate Size: 9” | Finish: Powder Coat

Nordic Pure 10x10x1 MERV 7 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home

sticker or extender

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 4 Pack lighting-&-electrical-components Two square obeservation windows onImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,