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

actual front end outer dimensions are approximately 26 5/8" width X 20 5/8" height

Complies with industry standards of USA: ASTM D-882

+ Product Details Size - 25"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 24"h X 2"d (for duct opening measurement only)

+ Product Details Size – 4"w X 14"h is the size for the duct opening measurement only

12" x 12" 3-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades Material_Steel 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