12" x 12" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 15" x 15"] 16" Round Duct Pipe + Product Details Size –

+ Product Details Size – Duct end cap is 16" X 10" | 26-gauge galvanized steel end cap

+ Product Details Size – 20"w X 8"h is the size for the duct opening measurement only

no competitor comes close to us - we use an extra thick board that prevents humidity

Design – Easy drop-in installation

12" x 12" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 15" x 15"] 16" Round Duct Pipe + Product Details Size –+ 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