20" X 20" Steel Access Panel Removable Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 21" Width X 21" Height] w20h20 the actual front end outer Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

the actual front end outer dimensions are 7" in diameter

Actual Filter Size – 35 3/4"w x 7 3/4" x 1"

+ Product Details Size – 12"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 32 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 8" or 8" x 12" duct opening (measured at the opening)

20" X 20" Steel Access Panel Removable Door For Wall Ceiling Application (Lock and Key) With Frame [Outer Dimensions: 21" Width X 21" Height] w20h20 the actual front end outer Compatible With Duct 7in Applications This sheet metal DDAG A 1212 the actual front end outer dimensions are 7" in diameter Actual Filter Size – 35 3 4"w x 7 3 4" x 1"