20" X 6" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 16" Diameter + Product Details Size -

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 30" or 30" x 8" duct opening (measured at the opening)

+ Product Details Size - 36"w X 26"h X 2"d (for duct opening measurement only)

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

20" X 6" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 16" Diameter + Product Details Size -+ Product Details Size 20"w X 6"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 8. 5"h] Actual Filter Size 19 3 4"w x 5 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,