40" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 42 5/8" X 12 5/8"] Fixed Blades actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

actual front end outer dimensions are approximately 16 5/8" width X 27 5/8" height

actual front end outer dimensions are approximately 32 5/8" width X 14 5/8" height

actual front end outer dimensions are approximately 26 5/8" width X 12 5/8" height -

75" width X 13

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

40" X 10" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 42 5 8" X 12 5 8"] Fixed Blades actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG A 1212 actual front end outer dimensions are approximately 16 5 8" width X 27 5 8" height actual front end outer dimensions are approximately 32 5 8" width X 14 5 8" height