09/06/2026
Fan energy is often treated as a minor item in pool HVAC design. It shouldn't be. Below are the physics that makes variable speed fans one of the most powerful carbon reduction tools in an indoor pool.
The affinity laws of fan physics are unforgiving for fixed-speed systems:
- Reduce fan speed by just 20% and you reduce power consumption by nearly 50%.
- Run a fan at 70% of full speed, and you're using only 34% of full-speed energy.
Most indoor pools operate at full occupancy for only a fraction of their total run hours. For the remaining time (early mornings, off-peak sessions, overnight), the ventilation demand is significantly lower.
Our units use fully variable ZA bluefin fans that respond dynamically to actual pool hall conditions. The BEMS monitors temperature, humidity and occupancy patterns and adjusts fan speed in real time, using only the energy the pool actually needs at any given moment.
Compared to a fixed-speed or two-speed competitor unit running at full power, this translates to fan efficiency improvements of up to a third over a typical operating year, directly reducing operational carbon and electricity costs.
For leisure centres and school pools operating on tight energy budgets, this isn't a marginal saving. Across a 25-year unit lifespan, it can represent saving tens of thousands of pounds and tonnes of CO₂.
Want to understand how variable fan technology could reduce your pool's carbon footprint? Get in touch, our engineers can model your specific pool usage profile.
