14" x 14" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover Aluminum + Product Details Size -

+ Product Details Size - 10"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 26"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

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14" x 14" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover Aluminum + Product Details Size -+ Product Details Size 14" X 14" 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