16" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 8 5/8"] w18h18 only measure the "hole" in 4 X 12 Is CRFG2028 Width_14in
Yard notes & kiln story
Description
only measure the "hole" in the wall/duct
+ Product Details Size - 34"w X 34"h is the size for the duct opening measurement only
and Diffusers
+ Product Details Size - 32"w X 25"h is the size for the duct opening measurement only
actual front end outer dimensions are approximately 20 5/8" width X 27 5/8" height -
16" X 6" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 18 5 8" X 8 5 8"] w18h18 only measure the "hole" in 4 X 12 Is CRFG2028 Width_14in only measure the "hole" in the wall duct + Product Details Size 34"w X 34"h is the size for the duct opening measurement only