Electric Air Duct Heater
Finned Elements
Cynebar Electric Duct Heaters can be custom made to suit your dimensions, utilizing of large range of stocked finned elements formed as a ‘U’ shape or ‘W’ shape. Locally Australian designed and fabricated in Brisbane to suit your application and requirements as a single phase or 3 phase unit. Option to offer SCR Control, SCR can be mounted in duct heater terminal box. Also provide over temperature thermostat and pressure switch protection as well as supply as a complete duct heater assembly in 900mm long casing to make installation easier.
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Australian Standards & Technical Specifications for Electric Duct Heaters
Backer Cynebar Ohmic designs and manufactures Electric Duct Heaters to suit the requirements of Australian HVAC and industrial air handling systems. All duct heaters are engineered with a focus on safety, performance, reliability, and compliance with applicable Australian electrical and engineering standards.
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Compliance with Australian Standards
Electric duct heaters installed in Australia should be designed and manufactured in accordance with relevant standards, including:
- AS/NZS 3102 – Approval and test specification requirements for electric inline and duct-type heaters.
- Applicable electrical installation requirements under the AS/NZS 3000 Wiring Rules.
- Project-specific HVAC, mining, infrastructure, defence, and industrial specifications where required.
Compliance with these standards helps ensure safe operation, reliable temperature control, and long service life.
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Technical Specifications
Heating Capacity
Backer Cynebar Ohmic duct heaters are available in a wide range of capacities, including:
- Small HVAC systems from approximately 0.25 kW
- Commercial and light industrial systems up to 30 kW
- Large custom-engineered industrial heaters exceeding 100 kW
Heater capacity is selected based on airflow, inlet temperature, required temperature rise, and operating duty cycle.
Electrical Supply Options
Single-Phase Heaters
- 240V supply
- Typically up to 3.6 kW
- Suitable for smaller HVAC and commercial applications
Three-Phase Heaters
- 415V supply
- Balanced load design across phases
- Suitable for medium and large commercial systems
- High-capacity industrial configurations available
Construction & Materials
Backer Cynebar Ohmic duct heaters are manufactured using robust industrial-grade materials designed for long service life and dependable performance.
Available construction options include:
- Galvanised steel casings
- 304 stainless steel construction
- 316 stainless steel construction
- Custom corrosion-resistant materials
Insulated casing designs can be provided where required to minimise external heat loss and improve energy efficiency.
Heating Elements
Our duct heaters utilise high-quality tubular or finned tubular heating elements manufactured using premium resistance wire and alloy sheath materials.
Benefits include:
- Uniform heat distribution
- Long operating life
- Controlled sheath temperatures
- Reduced maintenance requirements
- Reliable continuous-duty performance
Element loading is carefully selected to suit airflow conditions, operating temperatures, and application requirements.
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Airflow Requirements
Adequate airflow is critical to safe duct heater operation and maximum service life.
Design considerations typically include:
- Minimum airflow velocity requirements
- Air temperature rise calculations
- Pressure drop considerations
- Uniform airflow distribution across the heating elements
To protect the heater and air handling system, duct heaters can be supplied with:
- Differential pressure airflow switches
- Fan interlocks
- Air proving switches
- Building Management System (BMS) integration
These safety systems automatically isolate power if airflow falls below acceptable operating limits.
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Safety Features
All Backer Cynebar Ohmic duct heaters can be supplied with multiple layers of protection.
Primary Protection
- Automatic-reset temperature limiting controls
- Integrated temperature monitoring
Secondary Protection
- Manual-reset thermal cut-outs
- Independent high-limit temperature protection
Optional Safety Features
- Airflow proving switches
- SCR power control
Contactor monitoring
Earth leakage protection
Emergency shutdown inputs
BMS and PLC safety interlocks
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Installation Considerations
For optimum performance and reliability, consideration should be given to:
- Adequate straight duct lengths upstream and downstream
- Uniform airflow distribution
- Access for maintenance and inspection
- Temperature sensor placement
- Electrical isolation requirements
Our engineering team can assist with heater sizing, airflow calculations, and installation recommendations to ensure correct integration into the overall air handling system.
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Custom Engineered Solutions
Backer Cynebar Ohmic specialises in custom-designed electric duct heaters for:
- Air Handling Units (AHUs)
- HVAC systems
- Mining ventilation
- Make-up air systems
- Process air heating
- Drying applications
- Cleanrooms
- Industrial manufacturing facilities
Available configurations include:
- Rectangular duct heaters
- Circular duct heaters
- Multi-stage heaters
- SCR-controlled systems
- Stainless steel construction
- High-temperature process air heaters
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Need Help Sizing an Electric Duct Heater?
Selecting the right duct heater requires accurate assessment of:
- Airflow (L/s or m³/hr)
- Inlet and outlet temperatures
- Available electrical supply
- Duct dimensions
- Control requirements
- Site operating conditions
Contact Backer Cynebar Ohmic today for expert assistance with heater sizing, thermal calculations, and custom-engineered electric duct heating solutions manufactured in Brisbane, Australia. Our team can provide a technically optimised solution tailored to your HVAC or industrial process heating application.
FAQ
Frequently asked questions
Interested in finned elements?
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