Hi Tom :
Quoting from Wayne Tustin's book to be published in 2003 :
" BUILDINGS AND OFFICES
Modern (as compared to older) office buildings are characterized by low mass and by lack of structural damping. But where do architects tend to install powerful blowers, pumps, compressors, etc.? On the roofs. The upper floors (which should bring high rents) are sometimes vacant due to building vibration and accompanying noise.
Fans and other mechanisms inside office machinery can cause subtle malfunctions and fatigue failures. (See “The Business Machine Vibration Environment”, by Skinner and Zable of IBM, in The Journal of Environmental Sciences, Sept/Oct 1978.)"
Quote ends.
If heavy machines are not on isolators then the vibrations get transferred to the floor and nearby construction(s).
Deepak
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