The main fan overrun time on a Photon warm air heater is four(4) minutes after the 0 to 10 volt signal drops out. Please see the Photon Installation Manual (https://www.reznor.co.uk/wp-content/uploads/2025/05/Reznor-Photon-Installation-Manual-EN-2025-05-D301310-Iss-6.pdf) for more information.
How long is the main fan overrun time on the Photon?
Information on Reznor's range of warm air heaters