18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 5in this grille offers durability and

this grille offers durability and resistance to rust and corrosion

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 30" duct opening (measured at the opening)

8 bolts and lock nuts

Actual Filter Size – 23 3/4"w x 25 3/4" x 1"

The lightweight yet rigid construction ensures durability without sacrificing ease of handling

18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 5in this grille offers durability and+ 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,