Natural ventilation in non-domestic buildings by Chartered Institution Of Building Servic

By Chartered Institution Of Building Servic

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They are most commonly used for rooflights with relatively light frames. (c) Linear sleeved cable or rod: driven by a rack-andpinion, worm gear or chain drive electric motor and allow linear motion to be transferred, for example, to sliding sashes. g. trapping fingers or knocking people over Need to avoid ‘grey’ areas of responsibility for design, installation, testing and commissioning. 4 Background leakage It is very important to appreciate that purpose provided openings such as windows and ventilators are not the only routes through which outside air flows into the building.

Integrated controls are particularly important in such applications(22,38). 4 Operating natural ventilation openings Ventilators can be controlled in a number of ways. These include the following (in order of increasing sophistication): — On/off: the opening has two positions, fully open and fully closed. This coarse method is best suited to buffer spaces and atria in which close control of comfort conditions is not essential. It is also more suitable for outlet positions at high level and remote from individual workstations than to inlet positions near workstations, where it may cause draughts.

Some available products, including some glass louvres, have good seals but need to be carefully selected and checked for construction and performance. For most dampers, the shaft for the actuator motor projects out of the frame, from the end of one of the damper shafts. This is ideal for ductwork and air handling units as the motor can be installed, checked and maintained externally. However, for natural ventilation, the projecting shaft stops the dampers being installed in the plane of a wall, so either the dampers need to be fitted within a duct spigot or lever operation may be necessary.

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