- Located ahead of the blowing vents in an air-conditioning network. It is relatively low powered (a few kW)
- Circular duct heaters or "drawer type" duct heaters are the most widespread in use.
- "Drawer-type" heaters, which are designed to be installed directly in an opening made in the duct, are built around stored elements.
- They are bent upon request and can be delivered in small series in a week.
- Located upstream from the duct network at the air treatment station level
- It heats the treated air volume in its totality. Its power reaches a few tens of kW.
- Consisting of bare tubular elements or finned tubular elements, these duct heaters generate low transition losses. They are usually built around stored elements, assuring short delivery deadlines, and are installed in a frame made of galvanized steel sheet (stainless on request) sized to the dimensions of the blowing duct.
