36" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 4" Round Duct Pipe Do not measure the overall

Do not measure the overall size of the register itself

+ Product Details Size – 16" x 24" or 24" x 16" is the size for the duct opening measurement only

With its fully removable feature and safety hook

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 32" OR 32" x 28" duct opening (measured at the opening)

36" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 4" Round Duct Pipe Do not measure the overall+ Product Details Size 36"w X 20"h is the size for the duct opening measurement only, [Outer Dimensions: 38. 5"w X 22. 5"h] Actual Filter Size 35 3 4"w x 19 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,