The EdenPURE GEN 3 A4136/RTL heater is designed to exhaust all heat when the heater goes in to cool down mode. Cool down mode occurs when you turn off the unit or once the heater has achieved the desired temperature.
Like most edenpure heaters, the GEN 3 A4136/RTL is designed to circulate air in your environment every few minutes. This is even if your desired temperature has been reached. This cycle occurs every three minutes for about 20 seconds.