Frame in galvanized sheet metal, with a square or rectangular cross-section, is provided with flanges for perfect fit is the ducts.

Compartment electrical system assembled in a single body to the frame, is provided with a cover and encloses the electrical connections, the modular terminals and the safety thermostat.

Resistors are of armored finned for better and quick heat transfer.

Automatic reset safety thermostat, is provided with auxiliary contact for connection to an alarm signal and manual reset block.