An electric heater for duct installation, or electric duct heater, is used in an air transport system to heat air. The heat is transferred through electricity (230 or 400 Volt).
Material quality and thicknesses
For normal comfort ventilation, electric heaters for duct installation are manufactured from the following materials:
- Casing: Sendzimir galvanised steel or Alu-zinc sheet material;
- Heating element: stainless steel EN 1.4301;
- Protection class: at least IP 43;
- Other choice of material, depending on the application, in consultationwith the supplier.
The electric duct heater is available with circular and rectangular connections.
The available nominal sizes of the intermediate electric heaters are standardised to NEN-EN 1505 (rectangular connections) and
NEN-EN 1506 (circular connections) and can be chosen as shown in the tables for standard dimensions given in this Guide under chapters 126.96.36.199 (rectangular connections) and 188.8.131.52 (circular connections). They refer to the internal dimensions with a tolerance of +0 to -5 mm. The dimensions depend on the manufacture.
Electric heaters must be installed in accordance with the manufacturer's instructions. If available, they should at least comply with the requirements of section 3.1.4.
Built-in heaters with circular connections are more efficient to connect to the air ducts than heaters with rectangular connections and contribute to the airtightness of the air duct system, if these fittings have sufficient airtightness according to NEN-EN 15727.