18" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 20 5/8"] 18" Diameter 75" width X 31

75" width X 31

as the multidirectional design ensures consistent temperature control

Designed for both wall and ceiling applications

Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment

order a 14x20

18" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 20 5/8"] 18" Diameter 75" width X 31+ Product Details Size 18"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 20 5 8" height Actual Filter Size 17 3 4"w x 17 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.