Can you supply the fans for both the clean side and the exhaust side of a fab?
Yes, both, from one partner. On the clean side we engineer the cleanroom AHU and mini-environment supply fans, plus AHU supply and return for the surrounding areas; on the dirty side we engineer the acid-fume and process exhaust, fume-hood extraction, general dilution ventilation and local exhaust. Each fan is engineered to its own air quality, pressure and gas chemistry — the ultra-clean supply fan and the acid-fume exhaust fan are very different machines — but they come from one partner, on one engineering convention across the plant. We have executed a handful of semiconductor and electronics duties, and the underlying fan engineering is proven across our full range.
How do you keep a supply fan from contaminating the cleanroom it feeds?
Two ways, sized to your cleanroom class. First, vibration: we balance to ISO 21940 G2.5 as standard and tighten to G1.0 on application, so the fan runs smooth enough not to disturb the filtered air or the tools. Second, particle shedding: a sealed, low-shed wheel with a smooth or coated internal finish and inlet and casing detailing chosen so the fan does not add particles to the supply. The final HEPA stage sits downstream of the fan, but the fan is built so the air reaching it is as clean as we can make it. Tell us the ISO class, the air-change rate and the noise limit and we engineer to them.
Our process exhaust carries HF, HCl and solvent fume. What do you build the fan from?
We size the metallurgy to your gas analysis. For general acid fume the wetted path is built in 316L; for the most aggressive acids such as HF we build a moulded FRP wheel and casing, which does not corrode where stainless would. We add sealed shaft penetrations, corrosion-resistant coatings, and drainage detailing so acid condensate leaves the fan instead of pooling on the wheel. The right answer depends on your acid mix, concentration, temperature and moisture, so we engineer it to your gas, not a default.
How do you keep the fans from upsetting the fab's pressure cascade as filters load?
We select a fan with a stable, non-overloading curve — backward-curved or aerofoil — and place your duty point on the flat, high-efficiency part of it, so a rising filter differential pressure over the filter's life does not move the room. We pair it with VFD speed control tied to room-pressure and airflow feedback, so the fan trims itself to hold each zone a few pascal above the next dirtier one. Speed control also avoids the throttling loss of a damper at part load. The cascade stays exact even as the filters age.
Can you build a replacement to match our existing fab fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure, air or gas temperature, density and, on the exhaust side, the gas chemistry), bearing centres, inlet and outlet orientation and foundation bolt pattern so the unit drops onto the existing base and ducting — whether it is a cleanroom AHU fan, a mini-environment fan or an acid-fume exhaust 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, tightened to G2.5 or G1.0 on application for the clean-side fans. To be precise: that in-house testing is to the AMCA 210 / ISO 5801 method, not AMCA-certified; 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 solvent-laden exhaust area classification calls for it — those are self-declarations of conformity, not third-party certifications. Our only third-party certification is ISO 9001:2015.
