12" x 12" - 2-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 8" Diameter Measure the size of the

Measure the size of the air duct/drywall opening

actual front end outer dimensions are approximately 20 5/8" width X 12 5/8" height

Durable stamped steel construction ensures long-lasting performance

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

The permanently attached eight-tumbler lock with a supplied key adds an extra layer of security

12" x 12" - 2-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 8" Diameter Measure the size of the+ 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