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Cleanroom HVAC and Air Handling Equipment
Flanged Duct Electric Heater
A complete flanged duct section containing one six-element electric heater rack, external controls and airflow-related safety devices.
- Single Six-Element Rack
- Flanged Duct Installation
- External Safety Controls
- Withdrawable Heater Assembly
Product Introduction
The flanged duct heater mounts directly between rectangular duct sections and places six horizontal resistance elements across one airflow opening. Ceramic supports maintain element spacing, while the attached electrical enclosure houses contactors, terminals and high-limit protection. An airflow switch and staged controller prevent full power under inadequate ventilation, and the complete element rack can be withdrawn from the housing for inspection.
Key Features
Six horizontal elements form one uniform bank rather than separate obstructive columns.
The external control enclosure keeps contactors and wiring out of the heated airflow.
A manual-reset high limit and airflow interlock interrupt heating before unsafe temperature rise.
Customer Product Concerns
A duct heater must match airflow, electrical load and safety control without creating a high-pressure obstruction.
Low airflow can overheat the elements and adjacent duct insulation.Airflow proving and independent high-limit cutouts interrupt the contactor circuit.
Multiple narrow element columns cause uneven leaving-air temperature.One six-element rack spans the active width with consistent horizontal spacing.
Service access requires dismantling long duct runs.The heater rack withdraws laterally while the flanged outer housing remains installed.
Power switching generates heat and dust inside the airstream.Contactors, fuses and terminals are enclosed in the external side control cabinet.
Typical Applications
Cleanroom supply-duct trim heatingOutdoor-air temperingTerminal reheat branchesLaboratory exhaust replacement airProcess-air temperature maintenance
Technical Parameters
Representative dimensions and materials for a single-bank flanged duct heater are listed below.
| Core Material | Nickel-chromium resistance elements on ceramic supports inside galvanized duct housing |
|---|---|
| Panel Thickness | 1.0-1.5 mm galvanized duct casing thickness |
| Effective Width | 300-1800 mm active duct opening width |
| Maximum Length | Up to 900 mm overall casing depth in the airflow direction |
| Steel Facing Thickness | 1.0-1.5 mm galvanized casing and control-box sheet |
| Core Density | Approximately 8300 kg/m³ for the nickel-chromium resistance elements |
| Thermal Conductivity | Approximately 15 W/(m·K) for nickel-chromium resistance wire at room temperature |
| Surface Finish | Bright galvanized steel housing with exposed nickel-chromium elements and glazed ceramic supports |
| Joint Type | Bolted duct flanges with slide-out six-element rack and gasketed control enclosure |
| Customization | Available based on the intended application and operating environment. |
Available Options
Staged contactor, SCR or thyristor controlAirflow switch and differential-pressure provingAutomatic and manual-reset high limitsCustom flange size, voltage and control-box side
Planning a Flanged Duct Electric Heater specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
