Articles tagged “RC Mark II”
2 articles covering RC Mark II in acoustic engineering and building design.
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STANDARDS14 min readFeatured
ASHRAE Noise Criteria for HVAC Systems: NC, RC, and Design Limits
Master ASHRAE HVAC noise criteria — NC curves, RC Mark II method, design limits by room type, duct noise calculation, and common specification errors.
March 20, 2026
ASHRAEnoise criteria
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GUIDES16 min read
NC vs RC vs NCY — Which Noise Criterion? Most Engineers Pick Wrong | AcousPlan
NC misses rumble below 63 Hz. RC Mark II identifies spectral quality. NCY adds 5 dB penalty. Full comparison with decision matrix and worked example.
March 18, 2026
NC curveRC mark II