12" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 20 5/8"] w18h18 Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 24 3/4" x 1"

Noise free components - No vibrating louvers etc

actual front end outer dimensions are approximately 20 5/8" width X 12 5/8" height

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 40"w X 20"h is the size for the duct opening measurement only

12" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 20 5/8"] w18h18 Actual Filter Size – 13+ Product Details Size 12"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 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 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 your fingers and