34" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 36 5/8"] w30h30 Energy Efficient – Air-tight inner

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

+ Product Details Size - 20"w X 18"h is the size for the duct opening measurement only

providing efficient performance of up to 300m3/h

actual front end outer dimensions are approximately 16 5/8" width X 32 5/8" height

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

34" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 36 5/8"] w30h30 Energy Efficient – Air-tight inner+ Product Details Size 34"w X 34"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 36 5 8" width X 36 5 8" height Actual Filter Size 33 3 4"w x 33 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.