36" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 5" Diameter 5mm thick vent covers are

5mm thick vent covers are the most reliable in the industry

+ Product Details Size & Compatibilty - The 18" to 14" round metal pipe reducer & increaser 30 gauge is compatible with duct 18" to 14"

purposes with tumbler lock & key (2 keys included) and can be installed on drywall

+ Product Details Size – 28 x 30 x 18cm

36" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 5" Diameter 5mm thick vent covers are+ Product Details Size 36"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 38. 5"w X 14. 5"h] Actual Filter Size 35 3 4"w x 11 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,