At the new National Cash Registers office building in Dundee, a roof top plant room was required but the flue was not to be seen.  This meant that natural buoyancy was likely to be at a premium due to the short riser possible.

The project included five MHS Regency atmospheric boilers totalling 1567kW INPUT and a flue run that included a horizontal section longer than the vertical section with two 90° bends.  More than that, a plenum box was required so that two Exhausto fans could be operated in tandem to cope with the very large volume flow requirement.

Therefore, in conjunction with J.R.F. Chimney Specialists, Exhausto proposed a CAS8002 Chimney Automation System to control the draught and maintain a constant under-pressure in the entire system, regardless of the heat load or the prevailing weather conditions 22m up in the atmosphere!  This system needed two frequency converters to drive the fans, but both could be controlled from one Exhausto EBC12 modulating controller.

The complete chimney installation was carried out by JRF Chimney Specialists & Heating Distributors Ltd.

For more information please visit www.exhausto.com