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By B B Daly , BSc, CEng, MIEE, FIHVE

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For this reason it was at one The air and human well-being 3 time used as an index of the effectiveness of ventilation with limits of a half to one per cent, but this practice has died out. 5 Impurities such as methane or ozone occurring in natural fresh air at levels of less than 1 ppm (parts per million) may be ignored. Industrial processes, however, and the circumstances of town life, produce a wide variety of polluting substances which must be dealt with by ventilation. 1. 4. 3. 2. 14. 6 Odours may result from the presence of extremely small proportions of impurities in the air.

13. 7 Comfort Conditions During the heating season good heating and ventilating systems will be provided with thermostatic control, both for economy and for comfort Small rooms and offices should be individually controlled to meet variations in preferred temperature, which may range from 18°C to 28°C. Spaces accommodating many people must of course have a compromise setting which is likely to leave at least 10% of the occupants slightly dissatisfied-some too warm, some too cool. 25m/s is important to create a sense of freshness in the air.

As indicated in Fig. 2b adjustable registers in the duct wall secure uniformly distributed extraction along the length of the room. However, when a roof is available, the fan-powered roof units located as in Fig. 2a are likely to provide the most economical solution, in both first cost and running cost. 2 Supply and exhaust systems Air inlets round the walls are insufficient for large industrial buildings. They would be too far from the extract points and the air would become excessively heated or contaminated en route.

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