36" x 25" Steel Return Air Filter Grill for 1" Filter Removable Face/Door Powder-Coated we recommend purchasing one of

we recommend purchasing one of our HVAC access doors

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 18" or 18" x 6" duct opening (measured at the opening)

Actual Filter Size – 24 3/4"w x 33 3/4" x 1"

Its smooth

3x Coupling Sockets

36" x 25" Steel Return Air Filter Grill for 1" Filter Removable Face/Door Powder-Coated we recommend purchasing one of+ Product Details Size 36"w X 25"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 38 5 8" width X 27 5 8" height Actual Filter Size 35 3 4"w x 24 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.