18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 5in actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 24 5/8" height

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

Actual Filter Size – 33 3/4"w x 13 3/4" x 1"

+ Product Details Size - 16"w X 16"h is the size for the duct opening measurement only

18" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 5in actual front end outer dimensions+ 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,