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

By Mark E. Schaffer

A advisor that offers principles for controlling the noise and vibration of HVAC platforms.

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Inline Fans Inline fans do not change the direction of airflow and are typically used in ducted applications and include the vane-axial, tube-axial, propeller, and inline centrifugal types, as well as others. Each type of inline fan is best for a specific range of operating conditions. They all produce significant BPF tones, with vaneaxial and tube axial fans producing the strongest, while the tones from inline centrifugal fans are not as prominent. 27 --``,,`,``,```,,`,,```````,,`,,,-`-`,,`,,`,`,,`--- A Practical Guide to Noise and Vibration Control for HVAC Systems © 2011 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.

All duct system fittings, especially near a fan inlet or discharge, should be designed for the lowest practical pressure drop. 9. Because noise travels upstream and downstream from a fan, duct silencers and/or acoustical duct liner are sometimes required in both the inlet and discharge air paths. 10. Refer to the section titled “Duct System Components” later in this chapter for additional guidelines. AIR-HANDLING UNITS (AHU) AND FAN-COIL UNITS (FCU) Air-Handling Units (Draw-Through and Blow-Through) All of the general guidelines and special guidelines for centrifugal fans apply to air-handling units with one variation: the distance between the unit intake and the nearest wall should be at least the height of the unit (see Figure 2-19).

2011 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. 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. A Practical Guide to Noise and Vibration Control for HVAC Systems Figure 2-19 Minimum clearance at AHU and cabinet fan inlet. recent revision of AHRI 260—not an obsolete revision and not per AMCA 300, which is for fans only. Air-Handling Units Using Plenum Fans Systems with this type of AHU can sometimes be designed with short supply air path duct silencers, or sometimes without any silencers.

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