12" x 12" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 6" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 338 5/8" height

provide precise damper control and superior air dispersion

+ Product Details Size – 8" x 12" or 12" x 8" is the size for the duct opening measurement only

32" x 8" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

12" x 12" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 6" Round Duct Pipe actual front end outer dimensions+ Product Details Size 12" X 12" is the size for the duct opening measurement only, actual front end outer dimensions are 3". Design Equipped with lever for full airflow control; back blades made of black plastic for reduced air noise and discreet appearance; "Opposing" back blades, ensuring they don't overlap, provide precise damper control and superior air dispersion. High Quality Aluminum The premium durable aluminum will never rust and it will