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 5" width x 13 Product Details Size 30 LO1828 12in diameter

5" width x 13

+ Product Details Size - 20"w X 25"h is the size for the 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)

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

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

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 5" width x 13 Product Details Size 30 LO1828 12in diameter 5" width x 13 + Product Details Size 20"w X 25"h is the size for the duct opening measurement only