8" x 8" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 11" x 11"] RV Mobile Home + Product Details Size -

+ Product Details Size - 30"w X 26"h is the size for the duct opening measurement only

Mounted with a frame and bayonet joint

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 4" duct openings

Actual Filter Size – 19 3/4"w x 25 3/4" x 1"

+ Product Details Size – 12"w X 14"h is the size for the duct opening measurement only

8" x 8" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 11" x 11"] RV Mobile Home + Product Details Size -+ Product Details Size Refers to duct opening only. The face frame extends roughly 1. 5" on each side. Do not measure the overall grille for sizing. Design All aluminum frame and back blades. Rustproof and built to last in moisture prone environments. Quiet Airflow Opposing blade damper design reduces vibration and noise for smoother air distribution. Clean Finish White powder coated surface resists chips, scratches, and discoloration over time. Easy