Duct exhaust fan COLTSHAFT

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ColtShaft is a mechanical fire-fighting shaft system that provides equivalent performance to a BRE shaft for the ventilation of common corridors and fire fighting lobbies. It can therefore be considered to meet the recommendations of Building Regulations (E&W) Approved Document B, BS 9991 and BS 9999 for ventilation of stair cores. Under design conditions with the lobby doors open, ColtShaft provides a ventilation rate similar to the BRE shaft, but it also offers the benefit of being a lot smaller, providing 20% of the BRE Shaft footprint. ColtShaft requires a shaft with a cross sectional area which can be as small as only 0.6m² compared with 3m² for the BRE shaft or 1.5m² for a natural residential (ADB) shaft. This represents up to 80% reduction in the floor space required. It opens up the space on each floor, which allows architects to be more creative in their design, and improves the saleable or lettable space for the client. This in turn increases the profits for developers and the income for landlords, and permits more usable space. ColtShaft can perform better than a BRE Shaft since it extracts at a defined rate - this means that it is unaffected by external wind pressures. It is also less susceptible to obstructions to the airflow within the duct. The ColtShaft design has been proven by extensive CFD analysis and by empirical tests. There are two types of ColtShaft, the ColtShaft Variable and the ColtShaft Constant. The ColtShaft Variable incorporates duty and standby variable speed extract fans with inverter drive, linked to pressure sensors within the lobby and corridor at each level via the control panel.