6" X 6" Aluminum Access Panel Gypsum Board/Sheet Rock Door For Wall / Ceiling Application (PUSH-LOCK DOOR) With Frame - [Outer Dimensions: 7" Width X 7" Height] Compatible With Duct 8in + Product Details Size -

+ Product Details Size - 8"w X 36"h is the size for the duct opening measurement only

Multi-shutter damper with handle operator to adjust air flow

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 18" OR 18" X 16" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 14" OR 14" x 24" duct opening (measured at the opening)

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6" X 6" Aluminum Access Panel Gypsum Board/Sheet Rock Door For Wall / Ceiling Application (PUSH-LOCK DOOR) With Frame - [Outer Dimensions: 7" Width X 7" Height] Compatible With Duct 8in + Product Details Size -+ Product Details Size 6" X 6" is the size for the drywall opening measurement only, actual front end outer dimensions are 7" width X 7" 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 spaces.