The corpus of the electric duct heaters is made of galvanized metal sheets with flanges from steel profiles. A battery of electric heaters (covered type) with capacity Nel. from 3 kW to 48 kW. Heating capacity is divided in steps of 3 kW or 6 kW. The control options and steps number is defined when ordering. External corpus insulation can be added if required.
Emergency thermostat is provided  to prevent overheating. The thermostat turns off the control signal in power board at 70°С. By customer's request - power board with options for control and automation with additional elements of the ventilation installation. 

Construction of the electric heaters, allows incorporation in the air duct installation or ventilation equipment with flange connector. For service and inspection of the unit it is not necessary dismounting. Air flow direction to be kept when installing. Electrical supply is 3-phase 380V/50Hz (standard version) or mono-phase 220V/50Hz (by customer's request).

Control can be:

• Manual n-steps control;
• Automatic control on 2- or 3-steps with controller and working thermostats;
• Fluent 1-step regulation with controller, working thermostats and frequency converters type SSR, incorporated into the battery of EK-N. In this case the unit length is increased with 200mm;
• It is necessary EK power supply interlock with supply fan work to be provided;