16" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 38 5/8"] Filter Grille + Product Details Size –

+ Product Details Size – 20" x 20" is the size for the duct opening measurement only

+ Product Details Size - 30"w X 34"h is the size for the duct opening measurement only

R Value Rating of Insulation - R3

+ Product Details Size - 36"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 12" x 24" or 24" x 12" is the size for the duct opening measurement only

16" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 38 5/8"] Filter Grille + Product Details Size –+ Product Details Size 16"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 18 5 8" width X 38 5 8" height. High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Ceiling Design Fixed hinged for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your fingers and