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The connection from the ventilator to the control is low voltage and requires a 4 conductor (24 ga. minimum) LVT cable. Models are available with either a dehumidistat control or gas sensor. The following four options are available. Slide Switch Type Dehumidistat to engage high speed exchange. Slide switch operation supporting continuous low exchange and continuous high exchange. Push Button Electronic Type Dehumidistat to engage high speed exchange. Push-button operation supporting: intermitten