28" X 14" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Copper Coil Drainage Test: Run the pump

Drainage Test: Run the pump for an extended period

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 28" OR 28" x 30" duct opening (measured at the opening)

It serves as a main duct or plenum

Plumbing tubing is measured by it's inside diameter I

Actual Front End Outer Dimensions Are 8" Diameter

28" X 14" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Copper Coil Drainage Test: Run the pump+ Product Details Size 28"w X 14"h is the size for the duct opening measurement only, [Outer Dimensions: 30. 5"w X 16. 5"h] Actual Filter Size 27 3 4"w x 13 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,