18" X 16" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Side Out Ceiling Register Box and the full outer portion

and the full outer portion is double layered

actual front end outer dimensions are approximately 22 5/8" width X 28 5/8" height

actual front end outer dimensions are approximately 42 5/8" width X 22 5/8" height -

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 10" duct openings

18" X 16" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Side Out Ceiling Register Box and the full outer portion+ Product Details + Product Details Size 18"w X 16"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 18. 5"h] Actual Filter Size 17 3 4"w x 15 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