The most powerful 63A heater available. Designed and built for industrial use the FF42 features variable heat output, 24V control circuit for safety, remote thermostat socket, 500mm spigot, over temperature protection and an auto run on as standard. The FF42 is fitted with a powerful forward curved impeller that can deliver along 30m of ducting. Plug Size: 63A. Sound Level (3m): 73dB(A). Remote Thermostat. Phase Protection.