Do you make the axial fan or the centrifugal fan for a cooling tower?
We build the centrifugal fan. Most large cooling towers use a big-diameter axial fan pulling air out of the top of the cell, and that is a different machine. A centrifugal fan earns its place on a forced-draught tower, where the fan sits at the air inlet and pushes air through the fill, and on space- or pressure-constrained cells that cannot take a large axial rotor or need a little more static capability. If your tower is induced-draught with a top-mounted axial fan, tell us and we will say so plainly rather than fit the wrong machine.
The static pressure is tiny. Why does the fan selection still matter?
Because the fan is pure parasitic load and it runs continuously. At high flow and low static the difference between a good selection and a poor one is large in absolute kW, and the fan often runs 8,000 or more hours a year. A 150 HP tower fan held several points below its best static efficiency wastes tens of MWh a year, and over the tower's life that efficiency choice can outweigh the original purchase price. We size onto the best-efficiency region at your low-static point and tell you the offered efficiency on the quote, not a generic catalogue figure.
The air is saturated and the water is treated. What materials do you use?
Air leaving the fill is at 100 percent relative humidity, carries drift droplets, and holds whatever biocide, acid or scale-inhibitor the water treatment doses, so the wetted path sees standing condensate for the fan's whole life. We build the wheel and casing in stainless steel (304 or 316L) or hot-dip galvanised as default, in FRP or FRP-rubber-ebonite lining where the treated water is aggressive, and add epoxy or a special coating on milder carbon-steel builds. We size the material to your actual water chemistry and drift condition, not a default, and add casing drainage and a shaft seal so condensate does not reach the bearings.
How do you keep the tower fan within our site noise limit?
As standard we design to below 85 dB(A) at 1 m. Below 80 dB(A) is achievable with an inlet silencer and an acoustic-treated casing, and below 75 dB(A) with a custom acoustic enclosure or sound hood. A centrifugal wheel at the low static a cooling tower needs can run at a modest tip speed, which works in our favour on low-frequency content. Tell us the boundary noise limit and where the tower sits relative to occupied buildings, and we predict and engineer to it rather than fit a silencer after the complaint.
Should I specify VFD or an inlet vane damper for control?
VFD is our default. Cooling demand swings with the ambient wet-bulb and the plant load, so a tower cell rarely sits at design flow, and by fan-affinity the power falls with the cube of speed — part-load running on a drive is where the energy saving is. VFD also lets several cells share the load smoothly instead of cycling motors on and off. Inlet vane dampers remain available for legacy retrofit where the existing motor and starter cannot take a drive. We quote whichever your installation calls for.
Have you built cooling-tower fans before?
This is an engineered-capability page. We publish it because centrifugal forced-draught cooling-tower duty is squarely within what we design and build — high flow, low static, saturated wet air, continuous running — and shares its engineering with our air-supply, general-ventilation and data-centre cooling fans. Rather than claim a cooling-tower reference we do not have, we would rather be straight: tell us your cell flow, static, water chemistry and noise limit, and we will engineer the fan to it and prove the curve on the 200 HP VFD test rig before dispatch.
What is the lead time for a cooling-tower fan?
A standard engineered cooling-tower fan runs roughly 8 to 13 weeks order-to-dispatch: offer in 3 to 5 working days, GA drawing 2 to 3 weeks from PO, manufacture, balance and paint 5 to 9 weeks, and performance test plus FAT about a week. Stainless or FRP construction for aggressive water chemistry, or a full acoustic enclosure, adds material lead time — we confirm a dated commitment against your requirement rather than a placeholder.
Do you build to CE and ATEX, and are your efficiency claims independently 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 an area classification calls for it — those are self-declarations of conformity, not third-party certifications. Performance is tested in-house to the AMCA 210 / ISO 5801 method on our 200 HP VFD test rig; that is testing to the AMCA 210 method, not an AMCA certification, and we are not an AMCA member. Balance is to ISO 21940 G6.3 as standard, with G2.5 or G1.0 on application, and bearing life is a design target of L10h at or above 40,000 hours. Our only third-party certification is ISO 9001:2015.
