20" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 20 5/8"] w22h22 5" - SEE BELOW IN

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

actual front end outer dimensions are approximately 12 5/8" width X 12 5/8" height -

3 * Insulation density is 30kgs/CBM = 0

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Actual Filter Size – 23 3/4"w x 17 3/4" x 1"

20" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 20 5/8"] w22h22 5" - SEE BELOW IN+ Product Details Size 20"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 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 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