01
Drying ovens & dryers
Hot air supply and recirculation for batch and continuous dryers.
DUCT HEATER
Duct Heater
Tubular elements in a flanged frame, mounted directly into your duct — the whole air stream passes through the heated bank.
OVERVIEW
What it is
An electric duct heater heats process air directly: straight or finned tubular elements are mounted in a flanged frame that bolts between two duct sections. Finned elements enlarge the heat-transfer surface, so a compact bank can carry high power at moderate air velocity.
Staging or stepless SCR control keeps the outlet temperature stable while the fan ramps up and down. Interlocks with fan status and a downstream over-temperature thermostat protect the heater when airflow is lost.
Power range2 – 1000 kW
Air velocitytypically 2 – 12 m/s
Outlet temperatureup to 300°C
Duct connectionrectangular or round flange, to your dimensions
Elementsfinned or straight tubular, SS304 / SS321 / Incoloy
Controlstaged contactors or SCR stepless
Supply voltage380–415 V / 3Ph 50–60 Hz, other voltages on request
Protection degreeIP54 terminal box standard, IP65 optional
StandardsCE (LVD / EMC / MD), ATEX / IECEx on request
Hazardous areaEx execution for gas atmospheres available
APPLICATIONS
Where it works
02
Waste gas treatment
Pre-heating exhaust streams before SCR / RTO / biofilter stages.
03
Air handling & paint booths
Make-up air and recirculation air heating with stable outlet temperature.
SELECTION INPUT
What we need to size it
Five inputs are usually enough for a preliminary selection and power estimate. You do not need a complete data sheet to start the conversation.Air volume (m³/h) and duct cross-section
Inlet and required outlet temperature
Available pressure budget — finned banks add resistance
Fan interlock and safety thermostat requirements
Hazardous area or dust atmosphere, if any
FAQ
Common questions
What happens if the fan stops?
Airflow must be proven before power is enabled. We supply fan-differential-pressure interlocks and a redundant over-temperature limiter as the standard safety chain.
How clean is the air allowed to be?
Finned elements need reasonably clean air. For dust-laden exhaust we widen spacing, use straight tubes and recommend filtration upstream.
Can one heater serve two temperature zones?
Yes — element banks can be segmented and controlled independently in one flanged frame.
INQUIRY PREP
Come prepared, decide faster on Duct Heater
Have these parameters ready — they feed directly into model selection, power sizing and mechanical design review.- Air volume & duct size
- Inlet / outlet temperature
- Allowed pressure drop
- Fan interlock
- Hazardous or dust area