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