6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 4-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] Round Stack Boot 75"H – fits a 18"

75"H – fits a 18" X 6" duct opening

actual front end outer dimensions are 9" Width X 9" Height

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

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+ Product Details Size & Compatibilty - The 10" to 9" round metal pipe reducer & increaser 30 gauge is compatible with duct 10" to 9"

6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 4-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] Round Stack Boot 75"H – fits a 18"+ 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