12" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Rectangular Duct Caps Slots are angled to diversify

Slots are angled to diversify the airflow in 2 way direction

+ Product Details Size – 34"w X 10"h is the size for the duct opening measurement only

designed for systems up to 500lbs

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

12" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Rectangular Duct Caps Slots are angled to diversify+ Product Details Size 12"w X 18"h is the size for the duct opening measurement only, [Outer Dimensions: 14. 5"w X 20. 5"h] Actual Filter Size 11 3 4"w x 17 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,