nfpa 72 mass notification regulations november 10, 2011

NFPA 72 Mass Notification Regulations

November 10, 2011

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November 10, 2011

NFPA

Background

• 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 4-021-01

NFPA 72, 2007

• Approved by ANSI in 2009• Chapter 24– Emergency Communications Systems (ECS)

• ECS = EVACS + MNS

NFPA 72, 2010

• 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

• Intelligible Voice Messages

“Emergency communications systems shall be capable of the reproduction of prerecorded, synthesized, or live messages with voice intelligibility”

NFPA 72, 2010

• 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

• Speech Transmission Index & Common Intelligibility Scale Commonly used metrics 0.50 STI = 0.70 CIS

Speech Intelligibility

Example: STI

“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 DExample: STI

Speech Intelligibility

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

Acoustically Distinguishable Spaces

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

Acoustically Distinguishable Spaces

Logan Airport, Terminal A, HOK

Acoustically Distinguishable Spaces

Phillips Academy, Paresky Commons, Schwartz/Silver Architects

3-Legged Approach

Room Acoustics

Room Acoustics

Room Acoustics

Room Acoustics

HVAC Noise Control

HVAC Noise Control

HVAC Noise Control

HVAC Noise Control

Loudspeakers

Sound Systems

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

Sound Systems

Sound Systems

Sound Systems

Sound Systems

Understanding the Tools

Sound Systems

Loudspeakers

• Specifications• Types

– Horns– Full-range “Box” Enclosures

Sound Systems

• Types (cont.)

– Steerable Column Loudspeakers

– Line Arrays

Sound Systems

Mixers

Digital Signal Processing (DSP)

Amplifiers

Sound Systems

Speech Intelligibility Prediction

Speech Intelligibility Prediction

Speech Intelligibility Prediction

3D Computer Modeling

Speech Intelligibility Prediction

3D Computer Modeling

Speech Intelligibility Prediction

3D Computer Applications• EASE• Bose Modeler• CATT-Acoustic• Odeon

Speech Intelligibility Prediction

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

Speech Intelligibility Prediction

Case Study:

Rodriguez and Quiroga Architects, Homestead City Hall (unbuilt)

Speech Intelligibility Prediction

Speech Intelligibility Prediction

Speech Intelligibility Prediction

Identifying Potential Problem Areas

Speech Intelligibility Prediction

Creating Solutions

Speech Intelligibility Prediction

Intelligibility Measurement

Speech Intelligibility Measurement

Intelligibility Measurement

Plymouth State Ice Arena, Sasaki Associates

Questions?

Thank you for your time.

November 10, 2011