20" X 20" Aluminum Access Panel Gypsum Board/Sheet Rock Door For Wall / Ceiling Application (PUSH-LOCK DOOR) With Frame - [Outer Dimensions: 21" Width X 21" Height] w36h36 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 30" OR 30" x 36" duct opening (measured at the opening)

Design – removable door/face for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size – 6" x 32" or 32" x 6" is the size for the duct opening measurement only

and sound level range of NC 25 to 35

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 8" OR 8" x 28" duct opening (measured at the opening)

20" X 20" Aluminum Access Panel Gypsum Board/Sheet Rock Door For Wall / Ceiling Application (PUSH-LOCK DOOR) With Frame - [Outer Dimensions: 21" Width X 21" Height] w36h36 + Product Details Perfect Fit+ Product Details Size 20" X 20" is the size for the drywall opening measurement only, actual front end outer dimensions are 21" width X 21" height High Quality Strong and sturdy aluminum built to last and never rusts. Made with gypsum sheetrock for a seamless finish Design Aluminum frame material with sleek, shiny, durable white powder coat finish for an attractive look & moisture resistant to prevent mold & mildew buildup in indoor or outdoor