20" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 22 5/8" X 22 5/8"] w18h18 + Product Details Size -

+ Product Details Size - 18"w X 14"h is the size for the duct opening measurement only

Our coils have a very high PSI burst pressure

3 * Insulation density is 30kgs/CBM = 0

+ Product Details Size - 12"w X 30"h is the size for the duct opening measurement only

The 1/2" black insulation

20" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 22 5/8" X 22 5/8"] w18h18 + Product Details Size -+ Product Details Size 20"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 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 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