VENTILATION NOISE—CHARACTERISTICS, EFFECTS, AND SUGGESTED COUNTER-MEASURES

5.4.1 Occurrence

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5.4.1 occurrence
Ventilation is encountered today in practically all types of indoor environ­ments, e. g., in dwellings, leisure facilities, service facilities, schools, hospirals, factories, machine rooms, workshops, stores, offices, vehicles, meeting rooms, teaching areas, restrooms, and control rooms. The problem affects a very large number of people, both at work and during their leisure time. Com­plaints about ventilation noise have increased in recent years, at the same time as very limited efforts have been made to deal with the problem. The recom­mendations applicable to ventilation noise usually indicate a maximum ac­ceptable level of 35-40 dB(A). The highest recommended levels are exceeded, however, in many environments.

A .schematic view of a typical central station ventilation system, including a fan, ducts, and diffusers, is given in Fig. 5.59.

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