The ‘HEM’ series of indirect fired heaters are designed to fire applications where process air is to be heated from ambient temperatures up to the process plant requirements. The robust construction of the units makes them an ideal heat source for many industrial oven and heating systems; typical applications include spray booths and drying rooms. Operating air temperatures up to 300C can be accepted. The standard HEM heaters consist of a heat exchanger mounted inside a flanged and insulated steel duct section. The heat exchanger section is generously rated for heat transfer surface area and consists of a stainless steel combustion chamber and tube assembly. The combustion chamber and the tube bank assembly are independently mounted to cater for differential expansion. The outer casing of the HEM unit is manufactured from standard carbon steel and is of a double skinned, thermally insulated construction; insulation is available either 50mm or 100mm thickness depending on application requirements. The complete inner assembly can be withdrawn on its front plate for repair or servicing.
- Spray Booths
- Drying Rooms
Heater capacities of thermal outputs from 60kW to 1000kw are available; special units to meet the requirements of a particular application can be supplied.
Burners can be fitted for operation with natural gas, LPG, light fuel oils.
Direction of Airflow
Standard HEM heaters are arranged to fire horizontal in the direction of air flow from left to right (SF). Heater units can be supplied for firing into duct systems with vertical upwards or downwards air flow. Air flow should be uniform across the air duct, both upstream and downstream of the heater.
Heaters supplied with oil burners are normally for high-low operation (on-off on small units). Most gas burner applications are fitted with modulating burners, although high-low can be supplied.