30" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 32 5/8" X 8 5/8"] w18h18 allowing you to update the 4 X 12 Is CRFG2028 Width_14in

allowing you to update the aesthetic in your home without losing valuable seasonal control of your HVAC system

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

Slots are angled to diversify the airflow in 2 way direction

3 * Insulation density is 30kgs/CBM = 0

actual front end outer dimensions are approximately 31

30" X 6" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 32 5 8" X 8 5 8"] w18h18 allowing you to update the 4 X 12 Is CRFG2028 Width_14in allowing you to update the aesthetic in your home without losing valuable seasonal control of your HVAC system + Product Details Size – 20"w X 25"h is the size for the duct opening measurement only