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 Description Upgrade your Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Description Upgrade your ventilation with our premium grilles and registers

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

actual front end outer dimensions are approximately 38 5/8" width X 22 5/8" height -

+ Product Details Size – 30"w X 22"h is the size for the duct opening measurement only

Complies with industry standards of USA: ASTM D-882

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 Description Upgrade your Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Description Upgrade your ventilation with our premium grilles and registers + Product Details Size – 12"w X 30"h is the size for the duct opening measurement only