12" X 8" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES w36h36 while ensuring maximum filtration efficiency

while ensuring maximum filtration efficiency

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 36" duct opening (measured at the opening)

Design – These are specially sized to fit into all drop ceilings

+ Product Details Size & Compatibilty - The 6" to 4" round metal pipe reducer & increaser 30 gauge is compatible with duct 6" to 4"

make it compatible with 5" ducts

12" X 8" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES w36h36 while ensuring maximum filtration efficiency+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, [Outer Dimensions: 14. 5"w X 10. 5"h] Actual Filter Size 11 3 4"w x 7 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,