Sectors
Where these fans work
A 12 m³/s extract duty is the same aerodynamic problem in a car park and in a bakery. What changes is the material, the certification, the access for maintenance and what happens on the day it stops.
Tunnels & metro
Longitudinal and semi-transverse schemes, reversible axial and jet fans, and the fire case modelled rather than assumed. Nine schemes since 2019.
Car parks
Impulse ventilation with the CFD to justify the layout, F300 rated throughout, and a control philosophy that satisfies building control at first submission.
Data centres
Redundant extract and smoke clearance, N+1 arrangements, and vibration limits set by the building rather than by the fan standard.
Food & process
Washdown-rated stainless casings, wet duties, and impellers that can be pressure-cleaned without unbalancing themselves.
Energy from waste
Induced and forced draught to 550°C, wear-lined scrolls, and bearing arrangements designed for a hot shutdown.
Marine & offshore
Salt-laden air, coated or 316 throughout, ATEX Zone 1 and 2, and paperwork built for a class survey.
A worked example
Barrowfield multi-storey, Doncaster
Four levels, 620 spaces, and a soffit-to-slab depth of 2.4 metres that a ducted extract scheme would have eaten 350 millimetres of. The original design had 460 metres of galvanised duct at level 1 alone.
We modelled the structure as built — downstands, ramp, core walls and all — and replaced it with 34 impulse fans at 50 N and two 14 m³/s extract units at the ramp head. The CFD showed two corners that would not have cleared with an evenly-spaced layout, one of them the corner containing the CO sensor; four fans moved about six metres from where a plan-view layout would have put them.
Delivered in eleven weeks, commissioned across three days, and signed off by building control at first submission. The measured clearance time on the worst level was 4 minutes 20 seconds against a 10-minute requirement.
“They turned up to commission with a calibrated anemometer and a printed set of expected readings. Nobody does that. It turned a three-week argument about whose figures were right into an afternoon.”
Next step
Send us the duty and we will send back a curve
Volume, static pressure, air temperature and what is in it. If you only have two of those, ring us and we will work out the rest.