Can you supply the fans across the whole building, or only the AHU fans?
Across the whole building. We have executed 52 HVAC and commercial-building duties spanning AHU supply and return, general and dilution ventilation, car-park and basement extract, kitchen and commercial exhaust, roof and wall power ventilators, and the life-safety smoke and fire-emergency fans. Each fan is engineered to its own flow, pressure, noise target and code — the quiet, efficient AHU fan and the high-temperature smoke fan are different machines — but they come from one partner, on one engineering convention across the building.
HVAC is all about running cost. How do you make the fan efficient?
The duty point is engineered onto the best-efficiency region of an aerofoil or backward-curved wheel using our proprietary fan-selection software — not a catalogue fan throttled to suit — and then proven on our 200 HP VFD test rig before dispatch. VFD control is our default for HVAC so the fan tracks the actual building load rather than burning the throttling loss of a damper. Because an AHU or extract fan runs 8,000-plus hours a year, that best-efficiency selection is where the running cost is won or lost.
These fans sit close to occupied space. How do you keep them quiet?
Noise is treated as a specification, not an afterthought. We select a backward-curved or aerofoil wheel that runs slower for the same duty, which drops both blade-pass tone and broadband noise, and we dynamically balance every fan to ISO 21940 G6.3 as standard (G2.5 on application) so vibration tone does not carry into the structure. Where the project sets an octave-band or dBA limit we provide sound data and size matched inlet or discharge attenuators to it. Tell us the noise limit at the grille or the plant-room wall and we engineer to it.
What temperature and duration can your smoke-extraction fans handle?
Smoke and fire-emergency fans are built to the project's rated smoke duty — commonly 250 to 300 °C for a 2-hour rated period, and the envelope covers continuous 600 °C construction where a project calls for more. We size the casing, wheel and shaft for the rated temperature, and keep the bearings and motor out of the hot airstream or specify them for the rated period so the fan keeps turning through the fire. The rating, temperature and duration are stated on the GA drawing you approve — built to your smoke-ventilation requirement, not a generic rating.
Can you build a replacement to match our existing AHU or extract fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure and density), the bearing centres, the inlet and outlet orientation and the foundation or AHU mounting pattern so the unit drops onto the existing base and ducting — whether it is an AHU plug fan, a car-park extract fan, a roof ventilator or a smoke fan. Made to your installation, not a nearest-catalogue substitute. Send the old GA, the nameplate and a curve if you have one, and we match it.
Do you performance-test the fans, and what about AMCA, CE, ATEX and quality certification?
Every fan is performance-tested in-house to the AMCA 210 / ISO 5801 method on our 200 HP VFD test rig, and dynamically balanced to ISO 21940 G6.3 as standard (G2.5 / G1.0 on application). To be precise: that in-house testing is to the AMCA 210 / ISO 5801 method, not AMCA-certified, and we are not an AMCA member; CE is self-declared per 2006/42/EC and 2014/35/EU, and ATEX Zone 2/22 is self-declared per 2014/34/EU (Category 3) where a car-park or hazardous-area classification calls for it — those are self-declarations of conformity, not third-party certifications. Our only third-party certification is ISO 9001:2015.
