NFPA® 91 Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids 2010 Edition

Chapter 1 Administration

1.1 Scope
1.2 Purpose
1.3 Retroactivity
1.4 Equivalency

Chapter 2 Referenced Publications

2.1 General
2.2 NFPA Publications
2.3 Other Publications
2.4 References for Extracts in Mandatory Sections

Chapter 3 Definitions

3.1 General
3.2 NFPA Official Definitions
3.3 General Definitions

Chapter 4 Design and Construction

4.1 General Requirements
4.2 Duct Material and Construction
4.3 Access
4.4 Design Requirements
4.5 Hangers and Supports
4.6 Duct Installation

Chapter 5 Corrosive Materials

5.1 General

Chapter 6 Air-Moving Devices

6.1 General
6.2 Flammable or Combustible Materials
6.3 Clearance
6.4 Alignment
6.5 Maintenance and Inspection
6.6 Location
6.7 Flexible Connections

Chapter 7 Air–Material Separators (Air Separation Devices)

7.1 General Requirements
7.2 Separators for Noncombustible Particulates
7.3 Separators for Flammable Gases, Vapors, and Mists

Chapter 8 Ignition Sources

8.1 Electrical Equipment
8.2 Static Electricity
8.3 Manifolds
8.4 Open Flames and Sparks
8.5 Removal of Ferrous Materials
8.6 Belt Drives
8.7 Bearings
8.8 Equipment

Chapter 9 Fire Protection

9.1 General
9.2 Drainage
9.3 Testing and Inspection

Chapter 10 Testing and Maintenance

10.1 Retroactivity
10.2 General
10.3 System Test
10.4 System Inspection.
10.5 Cleanliness
10.6 Maintenance Program
10.7 Maintenance Log

Annex A Explanatory Material
Annex B Informational References
Index