What Is Basement Exhaust and CO Control?
The Founder's Explanation
"In basement, due to car parking, carbon monoxide will happen. That is harmful to humans. We need to remove that. So we run exhaust fan — basement exhaust fan."
Teaching the Concept
Basement car park. 6PM. Peak exit time. Twenty cars start engines. Reverse. Drive toward ramp. Each releasing exhaust gases.
In open air — disperses harmlessly. In enclosed basement — accumulates.
The gas that accumulates is Carbon Monoxide — CO.
You cannot see it. Cannot smell it. Cannot taste it. But at high concentrations — it causes unconsciousness. It can be fatal.
This is why building codes mandate CO monitoring and mechanical ventilation in all enclosed car parks.
BMS CO Control:
CO below 25 ppm: Safe. Fans at minimum speed.
CO reaches 50 ppm: BMS increases fan speed. More air changes.
CO reaches 100 ppm: BMS at full speed. Alert to facility team.
CO reaches 150 ppm: Emergency ventilation. Alarm activated.
CO drops to safe: BMS reduces speed. Energy saved.All automatic. No human intervention needed. Life safety maintained 24 hours.
Energy saving: fans run only as hard as CO level demands — not at 100% always.
40–60% energy saving on basement ventilation is standard with VFD and CO-based BMS control.
Related Topics
- What is BMS integration? — how a BMS connects with VFDs, energy meters, BACnet/Modbus devices and other building systems
- How to design a BMS system step by step — the complete BMS design methodology covering site survey, IO list, controller selection, sequence of operations
- What is a Building Management System (BMS)? — fundamentals of BMS controls and architecture for HVAC, lighting, energy and access
- What is BMS commissioning? — the disciplined commissioning process that turns a BMS install into a working building brain
- Browse all HVAC Systems topics — more from this section of the EnSmart BMS Library