6" x 6" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 1-Way actual front end outer dimensions

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

actual front end outer dimensions are approximately 13

+ Product Details Size - 20"w X 18"h is the size for the duct opening measurement only

See chart below:

Design - special "V" shaped louvers ensure 100% view block while ensuring easy un-restricted air flow

6" x 6" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 1-Way actual front end outer dimensions+ 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