Abstract
This chapter deals with establishing basic guidelines to control noise generated by a fan in a typical ventilation system. The topics discussed, such as fan modification, isolators, location, balancing and maintenance provides the proper tools to reduce the noise generated by any fan or air-moving device to the desired levels. The different types of mufflers, their advantages, disadvantages and limitations that provide added edge in quieting any air-moving device to an even higher degree are also discussed. The noise control engineer or industrial hygienist must be able to make recommendations based on predictable noise control data. The fan noise is proportional to the volume of air moved and the pressure developed by the fan. Properly balancing a fan is a factor in keeping the fan quiet. The location of a fan in a ventilation system becomes an important factor if maximum noise control is to be achieved. Properly balancing a fan is an important factor in keeping the fan quiet.
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