Aprilaire 4740 Relay
- Aprilaire 700 Fan Powered Humidifier 1 Needed
- Aprilaire 8140 Ventilator (Before October 2017) 1 Needed
- Aprilaire 8140NC Ventilator (Before October 2017) 1 Needed
- Aprilaire 8140NF Ventilator 1 Needed
- Aprilaire 8141 1 Needed
- Aprilaire 8142 Ventilator (After November 2017) 1 Needed
- Aprilaire 8142 Ventilator (Before November 2017) 1 Needed
- Aprilaire 8142NC Ventilator (After November 2017) 1 Needed
- Aprilaire 8142NC Ventilator (Before November 2017) 1 Needed
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