12" x 12" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades Insulated Line Set Actual Filter Size – 9

Actual Filter Size – 9 3/4"w x 21 3/4" x 1"

will last forever & never rust

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

12" x 12" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades Insulated Line Set Actual Filter Size – 9+ 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