18" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 12in Superior Airflow Control: Built-in damper

Superior Airflow Control: Built-in damper lets you control how much air enters your room

Mounted with frame and bayonet joint which are included

providing over 60 ways to store and organize your essential tools

Universal Fit – Dimensions of 6-3/8" wide x 3-1/2" high x 3" deep make it compatible with most standard thermostat models

10"w X 8"h Is The Size For The Duct Opening Measurement Only

18" X 12" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES Compatible With Duct 12in Superior Airflow Control: Built-in damper+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, [Outer Dimensions: 20. 5"w X 14. 5"h] Actual Filter Size 17 3 4"w x 11 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,