34" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 36 5/8"] w30h30 Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 5 3/4" x 1"

Actual Filter Size – 21 3/4"w x 13 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 16" duct opening (measured at the opening)

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

34" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 36 5/8"] w30h30 Actual Filter Size – 11+ 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.