24" X 24" Aluminum Access Panel Gypsum Board/Sheet Rock Door For Wall / Ceiling Application (PUSH-LOCK DOOR) With Frame - [Outer Dimensions: 25" Width X 25" Height] Return Grille + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 20"w X 25"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening)

actual front end outer dimensions are approximately 17" width X 17" height -

actual front end outer dimensions are approximately 42 5/8" width X 12 5/8" height -

24" X 24" Aluminum Access Panel Gypsum Board Sheet Rock Door For Wall Ceiling Application (PUSH LOCK DOOR) With Frame [Outer Dimensions: 25" Width X 25" Height] Return Grille + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 20"w X 25"h is the size for the duct opening measurement only + Product Details Size 22"w X 12"h X 2"d (for duct opening measurement only)