8" x 8" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 11" x 11"] Material_Aluminum Electrical Connections: Turn off the

Electrical Connections: Turn off the main power supply before making any electrical connections

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

Design – The stack boot at the bottom of the stack allows a transition from an ordinary large round or rectangular duct to a thin wall-mounted duct

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

ensuring they don't overlap

8" x 8" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 11" x 11"] Material_Aluminum Electrical Connections: Turn off the+ Product Details Size Refers to duct opening only. The face frame extends roughly 1. 5" on each side. Do not measure the overall grille for sizing. Design All aluminum frame and back blades. Rustproof and built to last in moisture prone environments. Quiet Airflow Opposing blade damper design reduces vibration and noise for smoother air distribution. Clean Finish White powder coated surface resists chips, scratches, and discoloration over time. Easy