12" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible with Duct 5" + Product Details Size -

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

Perfect for sidewall or ceiling installation

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 24" OR 24" x 18" duct opening (measured at the opening)

The dimensions

High Quality – High-quality

12" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible with Duct 5" + Product Details Size -+ 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,