30" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES fixed bar With a 8" diameter for

With a 8" diameter for the duct opening measurement

+ Product Details Size – 20"w X 50"h is the size for the duct opening measurement only

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

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

+ Product Details Size - 28"w X 32"h is the size for the duct opening measurement only

30" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES fixed bar With a 8" diameter for+ Product Details Size 30"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 32. 5"w X 14. 5"h] Actual Filter Size 29 3 4"w x 11 3 4" x 1" High Quality High quality rust free, strong aluminum construction with smooth finished edges for easy and safe use; Filter grille features a user friendly plastic latch that requires no screwdriver for opening. Installation Location Sidewall and ceiling. Design Heavier gauge than needed,