6" x 6" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w36h36 Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 33 3/4" x 1"

For 12" Round Duct Opening - Spiral or Flex

For 14" duct opening

+ Product Details Size – 8"w X 30"h is the size for the duct opening measurement only

6" x 6" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w36h36 Actual Filter Size – 23+ Product Details Size 6" X 6" 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 never