Aprilaire 4851
Blower Activation Relay for 500, 600 & 700 Series Humidifiers
Price:$26.00
Aprilaire 4851 automatic Blower Activation Relay for 500, 600, 700 & 800 Series Humidifiers. Allows digital control to turn on blower fan when there is a call for humidification even when heat is not needed.

Use in extra dry environments and applications where humidifier operation is required beyond a call for heat. It is highly recommended for humidifier to be plumbed to hot water when using this relay for maximum humidity efficiency.
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