12" x 12" 3-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 18" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 22 5/8" width X 18 5/8" height

actual front end outer dimensions are approximately 16 5/8" width X 10 5/8" height -

The Contempo slotted Grate

actual front end outer dimensions are approximately 16 5/8" width X 14 5/8" height

creating a quiet and efficient environment

12" x 12" 3-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 18" Round Duct Pipe actual front end outer dimensions+ Product Details Size 12" X 12" 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