24"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 25.875"W X 21.875"H] 12in diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 36"w X 20"h is the size for the duct opening measurement only

while the included safety wire provides added security to prevent the door from falling off

High-Quality Construction – Pump Gallon is made of ABS plastic

actual front end outer dimensions are approximately 18 5/8" width X 20 5/8" height

actual front end outer dimensions are approximately 18 5/8" width X 12 5/8" height

24"W X 20"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 25.875"W X 21.875"H] 12in diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 36"w X 20"h is the size for the duct opening measurement only while the included safety wire provides added security to prevent the door from falling off