25" X 14" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 27 5/8" X 16 5/8"] Adjustable Return Our innovative adjustable design changes Compatible with Duct 4" RG1612AL actual front end outer

Our innovative adjustable design changes the game

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 26 5/8" height

25" X 14" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 27 5 8" X 16 5 8"] Adjustable Return Our innovative adjustable design changes Compatible with Duct 4" RG1612AL actual front end outer Our innovative adjustable design changes the game + Product Details Size 30"w X 18"h is the size for the duct opening measurement only