Transformer Noise Problem - Performance of Acoustic Treatments and Vibration Isolators

The considerations for dealing with the reduction of noise from transformers in residential areas are discussed from the standpoint of necessity for acoustic treatment, type and design of treatment, and importance and design of vibration isolators. Quantitative data on the performance of various treatments and vibration isolators are given; and details are provided of an inexpensive wall combining high-absorption and transmission loss, and of an inexpensive short ventilating duct for providing high attenuation to transformer hum.