18" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 38 5/8"] 18" Diameter actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

actual front end outer dimensions are approximately 20 5/8" width X 32 5/8" height -

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

You may think of grilles and registers as a generic component of the ventilation system in your house

and centralized air ducted units

Our coils have a a very high PSI burst pressure

18" X 36" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 20 5 8" X 38 5 8"] 18" Diameter actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG A 1212 actual front end outer dimensions are approximately 20 5 8" width X 32 5 8" height + Product Details Size – 12"w X 12"h is the size for the duct opening measurement only