Group hot air with filter and thermal switch equipped with (idem DU4 & DU6 with a variable speed transmission integrated and a probe):

- Engine broken down high-strength thermics (200°),
- Dismountable wire mesh Filter,
- Insulation by rockwool HT density,
- Balanced impulse Turbine,
- Box galavanized guaranteed anti corrosion,
- Valve of mixture of new air ordered by thermal switch,
- Operation automatic and proportional to the temperature of the air aspired on the closed hearth.