ASHRAE Standards
Sections
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.
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.
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.
ASHRAE Transfer Functions for Heat Transfer
Comprehensive guide to ASHRAE transfer function methodology for calculating transient heat conduction through building envelopes and HVAC system components.
Humidity Control for Indoor Air Quality
Technical guide to humidity control in HVAC systems covering psychrometrics, health effects, moisture sources, control strategies, and ASHRAE standards.