10" x 10" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 12" Diameter + Product Details Size -

+ Product Details Size - 20"w X 6"h is the size for the duct opening measurement only

See our separate listing for Butterfly Dmaper to Control Airflow

Actual Filter Size – 11 3/4"w x 13 3/4" x 1"

+Why Hvac Premium HVAC Premium has been providing superior quality service for many years

10" x 10" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 12" Diameter + Product Details Size -+ Product Details Size 10" X 10" 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