12" x 12" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w6h6 + Product Details Outer dimensions:

+ Product Details Outer dimensions: – fits a duct opening

actual front end outer dimensions are approximately 20 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 38 5/8" width X 22 5/8" height -

Actual Filter Size – 24 3/4"w x 23 3/4" x 1"

Actual Filter Size – 33 3/4"w x 29 3/4" x 1"

12" x 12" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w6h6 + Product Details 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