8" x 8" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 14" Diameter + Product Details Size -

+ Product Details Size - 20"w X 10"h is the size for the duct opening measurement only

with actual outer dimensions of 16

actual front end outer dimensions are approximately 34 5/8" width X 22 5/8" height

actual front end outer dimensions are approximately 18 5/8" width X 26 5/8" height -

For 10" Round Duct Opening - Spiral or Flex

8" x 8" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 14" Diameter + Product Details Size -+ Product Details Size 8" X 8" 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