18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 6in ASTM D1056

ASTM D1056

actual front end outer dimensions are approximately 22" width X 16" height

+ Product Details Outer dimensions: 15

Installation Location – Floor

+ Product Details Size: 30w x 40h cm

18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 6in ASTM D1056+ Product Details Size 18"w X 20"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 22. 5"h] Actual Filter Size 17 3 4"w x 19 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,