HVAC Systems Encyclopedia

A comprehensive encyclopedia of heating, ventilation, and air conditioning systems

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Background Noise

Sections

HVAC Noise Criteria and Sound Level Standards

Technical analysis of NC curves, RC Mark II methodology, recommended noise criteria by space type, background noise measurement procedures, and speech interference levels for HVAC systems.

Noise Criteria for Engine Test Cell HVAC Systems

NC rating targets, octave band analysis, HVAC equipment specifications, background noise requirements, and measurement protocols for engine test facility acoustics.

NC 20 Noise Criteria for Concert Halls

Achieve NC 20 background noise in concert halls through low-velocity air systems, duct silencer design, equipment isolation, and comprehensive sound path analysis.

Background Noise Limits for Assembly Spaces

Technical guidance on establishing background noise limits for assembly spaces using NC/RC curves, speech privacy criteria, and masking principles per ASHRAE standards.