{"id":3811,"date":"2025-09-23T07:28:08","date_gmt":"2025-09-23T07:28:08","guid":{"rendered":"https:\/\/bhergonomic.com\/?p=3811"},"modified":"2026-07-13T09:33:18","modified_gmt":"2026-07-13T09:33:18","slug":"akustyka-biurowej-budki-telefonicznej-stc-vs-nic","status":"publish","type":"post","link":"https:\/\/bhergonomic.com\/pl\/office-phone-booth-acoustics-stc-vs-nic\/","title":{"rendered":"Oceny STC dla budek telefonicznych w biurach: co powinni wiedzie\u0107 nabywcy"},"content":{"rendered":"

Szybka odpowied\u017a<\/h2>\n\n\n\n

STC Ratings are useful for understanding how walls, doors, glass, or panels reduce airborne sound in controlled tests, but they should not be treated as the final proof of office phone booth privacy. For complete booths, buyers should also review NIC context, ISO 23351-1 speech level reduction, test direction, and the exact tested configuration.<\/p>\n\n\n\n

Last Updated: July 7, 2026 | Author: Richard | Estimated Reading Time: 12 minutes<\/p>\n\n\n\n

\"STC<\/figure>\n\n\n\n

STC Ratings vs NIC vs ISO 23351-1: Quick Comparison<\/h2>\n\n\n\n

If you are comparing office phone booth acoustic claims, the first mistake is treating every decibel number as the same kind of proof. I would separate the terms before comparing products.<\/p>\n\n\n\n

Metryczny<\/th>What It Mainly Describes<\/th>Najlepsze zastosowanie<\/th>G\u0142\u00f3wne ograniczenia dla kupuj\u0105cych stoisko<\/th><\/tr><\/thead>
STC Ratings<\/td>Laboratory sound transmission performance of partitions, doors, glazing, or assemblies<\/td>Comparing building elements and component-level sound isolation<\/td>Does not automatically prove whole-booth speech privacy<\/td><\/tr>
NIC<\/td>Noise isolation between spaces or enclosure conditions, depending on the test setup<\/td>Adding context when the complete enclosure or field condition is measured<\/td>The result depends heavily on setup, direction, and surrounding conditions<\/td><\/tr>
ISO 23351-1<\/td>Speech level reduction for furniture ensembles and enclosures<\/td>Comparing complete booths and enclosed furniture products used for speech privacy<\/td>Must be tied to the exact model and configuration tested<\/td><\/tr>
R\u00f3\u017cnica poziom\u00f3w d\u017awi\u0119ku przetestowana fabrycznie<\/td>A controlled internal measurement by a supplier or factory<\/td>Helpful supporting context when clearly separated from third-party standards<\/td>Not the same as a third-party ISO, ASTM, or field result<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The practical takeaway is simple: STC Ratings can help you understand acoustic components, but a booth is not just a component. A one-person booth includes panels, glass, a door, seals, ventilation paths, power penetrations, leveling, and installation details. Those weak points often decide whether speech remains private enough in a real office.<\/p>\n\n\n\n

What Do STC Ratings Actually Measure?<\/h2>\n\n\n\n

STC stands for Sound Transmission Class. In buyer-friendly terms, it is a single-number rating used to describe how well a building element or assembly reduces airborne sound transmission across a tested frequency range.<\/p>\n\n\n\n

That makes STC useful when you are comparing partitions, walls, doors, or glazing assemblies. For example, if an office project includes built rooms, conference-room walls, or permanent partitions, STC can be part of a serious specification discussion.<\/p>\n\n\n\n

For an office phone booth, however, STC Ratings are only part of the story. A vendor might mention STC because a panel, glass assembly, or door component performed well in a lab. That does not automatically mean the finished booth creates the same privacy result after the door, floor contact, ventilation opening, cable routing, and installation details are added.<\/p>\n\n\n\n

The standards landscape supports this distinction. ASTM E90<\/a> is associated with laboratory measurement of airborne sound transmission loss of building partitions and elements, while ASTM E413<\/a> covers how sound insulation ratings such as STC and related ratings are classified. Those references are valuable, but they do not turn a single panel number into a complete booth guarantee.<\/p>\n\n\n\n

Why STC Ratings Alone Can Mislead Phone Booth Buyers<\/h2>\n\n\n\n

The phrase “STC 30 panels” sounds reassuring. The problem is that buyers usually care about a different question: can people outside the booth understand the conversation happening inside?<\/p>\n\n\n\n

That real-world question depends on the complete enclosure. I usually look at five weak points before trusting any acoustic claim:<\/p>\n\n\n\n