40" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 42 5/8" X 22 5/8"] Filter Grille + Product Details High Quality

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

this grille boasts a natural warmth and fine finish

And is classified as Class 1 Fire Proof - B1

+ Product Details Size – 14"w X 8"h is the size for the duct opening measurement only

40" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 42 5/8" X 22 5/8"] Filter Grille + Product Details High Quality+ Product Details Size 40"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 42 5 8" width X 22 5 8" height 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. Our filter grille latch is easy to use on