Systemair EPH, FR800 El. Pre-heat 4.5kW

Pre-heater Topvex FR The pre-heater is an option and can be ordered as an accessory, to be installed outside the FR unit. For proper operation, the correct indoor conditions must also be met. The common ambient indoor temperature for the winter season is 72F (22°C) with 30-40% RH. Operating outside of that range may result in condensation of the casing and a considerable reduction in airflow.