Humidistat Controlled Power Vents

I did a crawl space inspection yesterday at a house in South Charlotte where I discovered a humidistat controlled power vent used by the homeowner to help control the crawlspace air quality. The unit was set on 30% Relative Humidity so the fan was running continuously sucking air out and pulling unwanted air in from the outside through the other open vents. With cooler temperatures, low humidity and dew point levels present now there is no reason for this ...

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