18" X 12" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 14 5/8"] w26h26 /* slightly looser */ color:

/* slightly looser */ color: #333

ensuring a perfect fit

Actual Filter Size – 19 3/4"w x 19 3/4" x 1"

Whilst the maximum pressure for R410 is 700 PSI

18" X 12" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 14 5/8"] w26h26 /* slightly looser */ color:+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 14 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