12" X 30" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Oval Stack Head + Product Details Size –

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

9% Pure Copper meeting ASTM B280 standards

actual front end outer dimensions are approximately 14 5/8" width X 18 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 10" duct openings

12" X 30" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Oval Stack Head + Product Details Size –+ Product Details Size 12"w X 30"h is the size for the duct opening measurement only, [Outer Dimensions: 14. 5"w X 32. 5"h] Actual Filter Size 11 3 4"w x 29 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,