12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover Compatible with Duct 10" this solid-base guard ensures long-lasting

this solid-base guard ensures long-lasting performance with minimal hassle

+ Product Details Size – 10"w X 18"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 18" duct openings

Actual Filter Size – 24 3/4"w x 29 3/4" x 1"

12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover Compatible with Duct 10" this solid-base guard ensures long-lasting+ 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