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NFPA 72 Mass Notification Regulations November 10, 2011.

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Presentation on theme: "NFPA 72 Mass Notification Regulations November 10, 2011."— Presentation transcript:

1 NFPA 72 Mass Notification Regulations November 10, 2011

2 Acentech Incorporated is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation. November 10, 2011


4 Background

5 Mass Notification Systems Provide real-time information and instructions to people in a building, area, site, or installation using intelligible voice communications along with visible signals, text, and graphics, and possibly including tactile or other communication methods DoD UFC NFPA 72, 2007

6 Approved by ANSI in 2009 Chapter 24 – Emergency Communications Systems (ECS) ECS = EVACS + MNS NFPA 72, 2010

7 Chapter 24 establishes Minimum required levels of performance, reliability, and quality of installation for ECS but does not establish the only methods by which these requirements are to be achieved. – Ex: Controls, Ancillary Functions, Pathway Survivability, and… – Voice Evacuation Messages: Sound System Requirements NFPA 72, 2010

8 Intelligible Voice Messages Emergency communications systems shall be capable of the reproduction of prerecorded, synthesized, or live messages with voice intelligibility NFPA 72, 2010

9 Intelligible Voice Messages Intelligible Metrics: Common Intelligibility Scale (CIS) Speech Transmission Index (STI) Speech Transmission Index for Public Address (STI-PA) RApid Speech Transmission Index (RASTI) Articulation Index (AI) AlCons (Percent Articulation of Consonants) Speech Intelligibility

10 Speech Transmission Index & Common Intelligibility Scale Commonly used metrics 0.50 STI = 0.70 CIS Speech Intelligibility Example: STI

11 The intelligibility of an emergency communication system is considered acceptable if at least 90 percent of the measurement locations within each ADS (acoustically distinguishable space) have a measured STI of not less than 0.45 (0.65 CIS) and an average STI of not less than 0.50 STI (0.70 CIS). -NFPA 2010 Annex D Example: STI Speech Intelligibility

12 Acoustically Distinguishable Spaces distinguished from other spaces due to acoustical, environmental or use characteristics, such as reverberation time and ambient sound pressure level Acoustically Distinguishable Spaces

13 MIT Sloan School of Management, Bruner/Cott Architects and Planners

14 Acoustically Distinguishable Spaces Logan Airport, Terminal A, HOK

15 Acoustically Distinguishable Spaces Phillips Academy, Paresky Commons, Schwartz/Silver Architects

16 3-Legged Approach


18 Room Acoustics




22 HVAC Noise Control




26 Loudspeakers Sound Systems Miami International Airport: Terminal H Improvements, Rodriguez and Quiroga Architects; South Terminal Expansion, Borrelli + Partners

27 Sound Systems



30 Understanding the Tools

31 Sound Systems Loudspeakers Specifications Types – Horns – Full-range Box Enclosures

32 Sound Systems Types (cont.) – Steerable Column Loudspeakers – Line Arrays

33 Sound Systems Mixers Digital Signal Processing (DSP) Amplifiers

34 Sound Systems


36 Speech Intelligibility Prediction

37 3D Computer Modeling

38 Speech Intelligibility Prediction 3D Computer Modeling

39 Speech Intelligibility Prediction 3D Computer Applications EASE Bose Modeler CATT-Acoustic Odeon

40 Speech Intelligibility Prediction Results/Calculated metrics: Direct SPL STI (Speech Transmission Index) Total SPL D/R Ratio RASTI Privacy Index Loudspeaker Overlap

41 Speech Intelligibility Prediction Case Study: Rodriguez and Quiroga Architects, Homestead City Hall (unbuilt)

42 Speech Intelligibility Prediction

43 Speech Intelligibility Prediction

44 Identifying Potential Problem Areas

45 Speech Intelligibility Prediction Creating Solutions

46 Speech Intelligibility Prediction

47 Intelligibility Measurement Speech Intelligibility Measurement

48 Intelligibility Measurement Plymouth State Ice Arena, Sasaki Associates


50 Questions? Thank you for your time. November 10, 2011

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