20" X 40" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES White Backflow Stopper - Yes

Backflow Stopper - Yes

+ Product Description Introducing our 10" x 12" or 12" x 10" Floor Grille - a reliable and durable air grill designed for exceptional performance and built to last

Enjoy the flexibility of easy bends without compromising structural integrity

Design – This duct fitting is designed for transitioning oval wall stack ducting to round sheet metal pipe

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 12" or 12" x 6" duct opening (measured at the opening)

20" X 40" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES White Backflow Stopper - Yes+ Product Details Size 20"w X 40"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 42. 5"h] Actual Filter Size 19 3 4"w x 39 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,