Articles tagged “hvac noise”
3 articles covering hvac noise in acoustic engineering and building design.
The 15 Acoustic Design Mistakes Architects Make — And the Standard Clauses That Prevent Them
15 specific acoustic design errors that architects commonly make, each matched with the exact standard clause that would have prevented it. Covers NRC misuse, low-frequency neglect, parallel wall flutter echo, soundproofing vs treatment confusion, HVAC noise, glass overuse, ceiling-only treatment, room modes, Sabine misapplication, occupancy effects, and flanking transmission. Includes worked examples and remediation costs.
NC Curves Explained: Understanding NC-25, NC-35, NC-45 Background Noise Ratings
A comprehensive guide to Noise Criteria (NC) curves: how they work, how to determine an NC rating, target values for every room type, and the differences between NC, NR, and RC rating methods. Includes ASHRAE recommended levels and step-by-step calculation examples.
Noise Criteria Explained: NR, NC, and RC Curves — Which One Does Your Project Need?
NR (Noise Rating), NC (Noise Criteria), and RC (Room Criteria) all rate background noise levels in buildings — but they use different curves, different frequency ranges, and are required by different standards. Here is how each system works, when to use which, and the specific values your HVAC engineer needs to hit.