Explore demand-based fan and ventilation control using BMS, CO sensors and occupancy signals to reduce unnecessary energy use.
The most effective building and utility improvements come from combining reliable field data with engineering context, clear operational ownership and a repeatable process for acting on exceptions. This article explains the practical considerations behind that approach.
1. Fans can consume energy for many unnecessary hours
Ventilation systems are often commissioned conservatively and then left on fixed schedules. If actual demand varies, this can create long periods of unnecessary runtime.
2. Use the right demand signal
Car parks commonly use CO sensing, while occupied areas may use CO₂, temperature, occupancy or schedule logic. Safety and local-code requirements always take priority over energy objectives.
Use the available data to narrow the investigation, but confirm the root cause with site context before changing controls, billing or maintenance decisions.
3. Control should be staged and observable
A practical strategy uses thresholds, delays and minimum run times to avoid unstable switching. Operators should also be able to see sensor values, fan status and override conditions in the BMS.
4. Verify savings through runtime and energy data
Reduced runtime is useful, but the better measure is actual fan energy and maintained environmental conditions before and after the control change.
