20" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Rectangular Duct Caps + Product Details Size –

+ Product Details Size – The size 30-gauge stick-on collar is 16" and it is compatible with duct 16"

actual front end outer dimensions are approximately 22 5/8" width X 52 5/8" height

One model suits both T-Bar and Drywall installations

+ Product Details Size – 24"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 8"h is the size for the duct opening measurement only

20" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Rectangular Duct Caps + Product Details Size –+ Product Details Size 20"w X 18"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 20. 5"h] Actual Filter Size 19 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,