Acoustics
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.
Noise Criteria for Performance Venues
Technical guidance on HVAC noise criteria (NC) curves for performance venues including concert halls (NC-20), theaters (NC-25), lecture halls (NC-30), and arenas (NC-35) with SPL calculations and design strategies.
Displacement Ventilation Acoustics
Technical analysis of displacement ventilation systems for assembly spaces covering low-velocity acoustic advantages, thermal stratification effects, and NC curve compliance.
NC-25 Theater HVAC Acoustic Design
Technical design requirements for achieving NC-25 acoustic performance in theaters including octave band limits, sound transmission calculations, audience size considerations, and HVAC system strategies.
HVAC Reverberation Time Coordination
Engineering guidance on coordinating HVAC system design with architectural acoustics including RT60 calculations, diffuser placement, and absorption contributions.
NC-30 Lecture Hall HVAC Acoustic Design
Technical guidance on achieving NC-30 acoustic criteria in lecture halls including octave band limits, speech intelligibility requirements, HVAC system design, and sound path analysis.
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.
NC-35 Arena HVAC: Large-Scale Acoustic Design
Technical guidance for achieving NC-35 noise criteria in sports arenas and multipurpose venues using high-capacity air handling, large-scale cooling systems, and acoustic control strategies.
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.