25" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 27 5/8" X 22 5/8"] Width_20in + Product Details Size –

+ Product Details Size – 16"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 4"h is the size for the duct opening measurement only

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

Installation of the vents will eliminate the need to raise the door ensuring security and constant air flow and reduced heat transfer into attics and adjacent house walls

25" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 27 5/8" X 22 5/8"] Width_20in + Product Details Size –+ Product Details Size 25"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27 5 8" width X 22 5 8" height Actual Filter Size 24 3 4"w x 19 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.