8" round ceiling diffusers with adjustable butterfly damper. White plastic diffusers are recommended for each ceiling regidter connection to the DFAS cabinet. These diffusers are easy to install and allow you to adjust the airflow by simply turning the knob in the center. Although the DFAS Blowers feature internal spring loaded dampers when they are not in use you may want to close off the dampers durng the winter if you are using our DFAS for cooling only. You will need one diffuser per ceiling register.
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