6" x 6" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w18h18 } /* Added styles for

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complete with a supplied key

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

actual front end outer dimensions are approximately 18 5/8" width X 34 5/8" height

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6" x 6" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w18h18 } /* Added styles for+ 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