A Practical Guide to Noise and Vibration Control for HVAC by Mark E. Schaffer

By Mark E. Schaffer

A consultant that offers principles for controlling the noise and vibration of HVAC structures.

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C. d. 6. For downward noise control, use a building standard slab with a gypsum board ceiling suspended below using spring hangers (see Figure 1-7). The suspended ceiling is also an alternative to an equipment enclosure for upward noise control, but it can be difficult to implement where the room has a lot of suspended piping and conduits. For both upward and downward noise control, consider a monolithic slab weighing at least 500 kg/m2. In the most critical cases, including screw chiller and vane axial installations, use a 500 kg/m2 floating floor assembly.

Org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission. General Design Guidelines Section views through two types of floating floor assemblies. Figure 1-9 Sound transmission at perimeter mechanical rooms. --``,,`,``,```,,`,,```````,,`,,,-`-`,,`,,`,`,,`--- Figure 1-8 12 © 2011 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. org). For personal use only.

The equipment sizes and manufacturerrecommended maintenance clearances should be given to the architect, who can allocate equipment rooms of the proper size. Slab Selection The schematic design phase is also the proper time to determine the thicknesses (and, therefore, the weights) of the slabs that provide sound isolation between equipment rooms and any occupied spaces that are either above or below the equipment room. Table 1-2 gives preliminary slab thickness suggestions for various types of equipment.

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