36" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 16" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

The above sentences briefly describe a process that is an integral part of manufacturing

The integrated damper allows precise control over airflow

PRACTICAL DESIGN - The rectangular end cap is designed to terminate a main trunk duct run

What does this mean

36" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES 16" Diameter actual front end outer dimensions+ Product Details Size 36"w X 18"h is the size for the duct opening measurement only, [Outer Dimensions: 38. 5"w X 20. 5"h] Actual Filter Size 35 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,