Pushing or pulling air through heating coils or across any other type of heater is a primary function of fans. Combustion air blowers for boilers and process heaters require pulsation-free stable airflow to keep the burner controls constant.  Oven and furnace fans require a long life with special attention to bearing life and mechanical reliability.  Boiler applications, fired heaters and dryers for chemical process installations all require the same reliability.  ​