25" X 25" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Height_16in + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – The size 30-gauge stick-on collar is 6" and it is compatible with duct 6"

+ Product Details Size - 8"w X 16"h X 2"d (for duct opening measurement only)

+ Product Details Size – 20"w X 12"h or 12" x 20" is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of the side round ceiling box is 12" X 12" X 4" and it is compatible with duct 4"

Whether you need to create trunk lines or branch-like runs

25" X 25" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIR FLOW LINEAR BAR GRILLES Height_16in + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – The size 30 gauge stick on collar is 6" and it is compatible with duct 6" + Product Details Size 8"w X 16"h X 2"d (for duct opening measurement only)