14" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 20 5/8"] Material_Aluminum actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 27 5/8" height

Whilst the maximum pressure for R410 is 700 PSI

+ Product Details Size - 25"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 26 5/8" height -

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

14" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 20 5/8"] Material_Aluminum actual front end outer dimensions+ Product Details Size 14"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 20 5 8" height Actual Filter Size 13 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.