Duct fans are a ideal solution for installation as part of a ducting system with varying distances and pressures. They can move large volumes of air at low pressure or be as part of a higher pressure system. This category of fans includes fireplace fans, for example the FN series which extracts hot air from the fireplace surround into a room. These fans come with a thermostat. Easy mounting in any position is possible within the flow. Grilles are recommended for the wall or ceiling.