36" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 38 5/8" X 20 5/8"] w36h36 Pressure Rating: 2100 to 7000

Pressure Rating: 2100 to 7000 PSI

Actual Front End Outer Dimensions Are 5

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

but still very thin

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

36" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 38 5/8" X 20 5/8"] w36h36 Pressure Rating: 2100 to 7000+ Product Details Size 36"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 38 5 8" width X 20 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