12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 8" Round Duct Pipe Filter Size - 11

Filter Size - 11

actual front end outer dimensions are approximately 27 5/8" width X 24 5/8" height

Actual Filter Size – 31 3/4"w x 7 3/4" x 1"

this guard fits almost any thermostat and blends seamlessly into any setting

12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 8" Round Duct Pipe Filter Size - 11+ 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