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Fantech Triple Function HRV/ERV Control - EDF 1 Works with Fantech Heat Recovery and Energy Recovery Ventilators (SHR/VHR/SER). This low-voltage Triple-Function Wall Control provides on/off, low/high speed selection, 20 min on / 40 min off cycle. It’s easy to control your home’s indoor air quality system with this triple function wall control. * Press the button once to run your HRV/ERV at a continuous low speed (Green). * Press the button twice and the unit will run 20 Minutes On/40 Minutes Off (Yellow). The cycle repeats continuously. * Push the button three times and the system will run continuously on high speed (Red).