Key features of the system:
- roof and duct fans for air extraction
- negative pressure ventilation
- without heat recovery
- suitable for refurbishments or cost-effective projects
Basic system components:
- roof fan
- duct fan
The system does not utilise heat recovery. Stale air is extracted from sanitary facilities and changing rooms using roof or duct fans. Fresh air is supplied to these areas indirectly from other ventilated spaces.






