Industrial forced draft fans (FD Fans) operate by focusing the pressure and volume at the outlet of the fan to push air through a system. This focus creates positive air pressure.
Though many applications call for positive pressure, requirements for forced draft are most often found in boiler applications. "Teploagregat" builds the industrial fans, blowers, and dampers necessary to maintain the highest-efficiency forced draft process air.
Fans that are used to evacuate a space or create negative air pressure in a system are referred to as induced draft fans (ID fans). Occasionally, manufacturing spaces are required by specifications to be maintained at a specific negative pressure. Induced draft is also used to identify the combustion process used in large boilers. When mechanical ventilation is supplied to these boilers, the heat transfer rate increases; the boiler can be reduced in size to produce the same amount of energy as natural draft. The induced draft fans used in combustion systems are normally high temperature and extra heavy-duty construction.