DRAC Big air generators 

For compensating the atmosphere where high air flow is required (over 20000 mc/h) particularly efficient and silent centralized air treatment units are available.
A high efficiency, large surface, filter in polyester fibre guarantees excellent air quality without reducing performance.
The internal insulation and the large fan size minimize noise and vibrations.
Available are air treatment units heated by means of hot water,steam or gas or oil generators.