INDUCED DRAFT UNIT The induced draft unit provides a steady and durable thermal performance due to the protection of the finned surfaces against wind, rain, and snow by the plenum chamber. The induced draft also ensures:
- a better air distribution,
- less hot air recirculation,
- less fouling,
- lower noise at grade.

FORCED DRAFT UNIT The forced draft unit allows an easy access for maintenance to the fans and to the bundles. Furthermore, the fans remain in the cold ambient air.