36" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 38 5/8" X 20 5/8"] flat stamped steel + Product Details Size – 4 X 12 Is CRFG2028 Width_14in
Yard notes & kiln story
Description
+ Product Details Size – 10"w X 6"h is the size for the duct opening measurement only
Complies with industry standards of USA: ASTM D-882
and a polished
Filter Size - 17
+ Product Details Size – 12"w X 30"h is the size for the duct opening measurement only
36" X 18" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 38 5 8" X 20 5 8"] flat stamped steel + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10"w X 6"h is the size for the duct opening measurement only Complies with industry standards of USA: ASTM D 882