32" X 32" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 34 5/8" X 34 5/8"] Compatible With Duct 8in It features an eight-tumbler lock

It features an eight-tumbler lock with a supplied key for secure access

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

+ Product Details Size – 8"w X 10"h is the size for the duct opening measurement only

With a 5" diameter for the duct opening measurement

Actual Filter Size – 19 3/4"w x 9 3/4" x 1"

32" X 32" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 34 5/8" X 34 5/8"] Compatible With Duct 8in It features an eight-tumbler lock+ Product Details Size 32"w X 32"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 34 5 8" width X 34 5 8" height Actual Filter Size 31 3 4"w x 31 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.