It is time to upgrade my sink and ventilation system. The ceiling fan in the converted bathroom just isn't doing the job. I thinking of an outlet duct just above tray height on the sink back with a fan mounted in the attic. This would be combined with a filtered inlet fan to create a slight positive pressure.
After viewing several treads here and a web search I have not found the air flow rate and velocity required extract the fumes. One site refers to a Kodax recomendation of 75 fpm at the tray and a room exchange rate of 5 times per hour,
Does anyone have design criteria or recomend a reference source?
Thanks in advance
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