FORM 100.50-EG5 (108)

In the non-modulating exhaust system, the exhaust air- flow is constant whenever the exhaust fan is operating. This type of control should only be used to either assist a smoke purge system or when a system requires a constant volume of exhaust airflow.

ACOUSTICAL CONSIDERATIONS

The Eco2 unit is designed for lower sound levels than competitive units by using flexible fan connections, fan spring isolators, double-wall construction, multiple fan options, and lower speed and horsepower fans. For VAV applications, VFDs are used instead of inlet guide

vanes. Additional sound attenuation can be obtained using compressor sound blankets and field-supplied sound attenuators when necessary.

Even with these equipment design features, the acousti- cal characteristics of the entire installation must never be overlooked. Additional steps for the acoustical character- istics of a rooftop installation should be addressed during the design phase of a project to avoid costly alterations after the installation of the equipment. During the design phase of a project, the designing engineer should con- sider, at a minimum, the impact of the equipment location, rooftop installation, building structure, and duct work.

JOHNSON CONTROLS

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York HFC-410A manual Acoustical Considerations