NC Curves
Sections
HVAC Noise Contribution in Assembly Spaces
Technical analysis of HVAC system noise contributions in assembly spaces including component-level breakdowns, noise path analysis, budgeting methods, and design margins.
Displacement Ventilation Acoustics
Technical analysis of displacement ventilation systems for assembly spaces covering low-velocity acoustic advantages, thermal stratification effects, and NC curve compliance.
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.
Air Distribution Acoustics for Assembly Spaces
Technical analysis of regenerated noise, terminal device selection, and duct design strategies for achieving NC 15-25 performance in theaters and concert halls.
HVAC Acoustic, Noise & Vibration Control
Comprehensive guide to HVAC acoustics covering sound power and pressure calculations, noise criteria, vibration isolation, and sound attenuation strategies per ASHRAE standards.
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.
Acoustic Considerations for Assembly Space HVAC Systems
Comprehensive technical guidance on HVAC acoustic design for theaters, concert halls, and lecture halls including NC curve requirements, sound power analysis, and low-velocity strategies.