12" X 24" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 10" Diameter display === 'none' || dd

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+ Product Details Size & Compatibilty - The 10" to 4" round metal pipe reducer & increaser 30 gauge is compatible with duct 10" to 4"

14"w X 6"h Is The Size For The Duct Opening Measurement Only

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12" X 24" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 10" Diameter display === 'none' || dd+ Product Details Size 12"w X 24"h is the size for the duct opening measurement only, [Outer Dimensions: 14. 5"w X 26. 5"h] Actual Filter Size 11 3 4"w x 23 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,