10" X 10" Steel Access Panel Removable Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 11" Width X 11" Height] w25h25 + Product Details Perfect Fit CRFG2028 Width_14in 4 X 12 Is

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 10" or 10" x 12" duct opening (measured at the opening)

actual front end outer dimensions are 21

180 Degrees Double Direction Adjustable - Fins Are Manually Adjustable Individually for Optimal Air Distribution

10" X 10" Steel Access Panel Removable Door For Wall Ceiling Application (Lock and Key) With Frame [Outer Dimensions: 11" Width X 11" Height] w25h25 + Product Details Perfect Fit CRFG2028 Width_14in 4 X 12 Is + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening) Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings