Reliable, without fan. Using for: room warmer, tank dryer, electric cabinet equipment anti-freezer, outdoor signboard Air heating element1. TypesBlowing type: insulated type with wave radiator, uninsulated type with wave radiator, insulated type with inserted foil radiator, insulated type with comb radiator.Heater with fan: insulated type with fan, uninsulated type with fan.Convecting type air ...