6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 1-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] 3" Round Duct Pipe Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

and sound level range of NC 25 to 35

+ Product Details Size – 22" x 36" or 36" x 22" is the size for the duct opening measurement only

order a 14x20 grille

actual front end outer dimensions are approximately 10 5/8" width X 34 5/8" height

6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 1-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] 3" Round Duct Pipe Actual Filter Size – 13+ 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