This standard provides minimum requirements for properly venting vapors, mists, and fumes to avoid fire and explosion hazards. The standard covers the design, construction, installation, operation, and testing of exhaust systems for air conveying of vapors, gases, mists, and noncombustible particulate solids.
The following editions have been incorporated by reference (IBR) into the Code of Federal Regulations (CFR):
| IBR approved for | Overview of requirements | IBR approved edition |
|---|---|---|
| 29 CFR 1910.94(a)(4)(i) | Employers must ensure the construction, installation, inspection, and maintenance of exhaust systems conform to the principles and requirements set forth in American National Standard Fundamentals Governing the Design and Operation of Local Exhaust Systems, Z9.2-1960, and ANSI Z33.1-1961. | ANSI Z33.1-61 Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying.1 |
| 29 CFR 1910.107(d)(1) | Employers must ensure ventilating and exhaust systems are in accordance with the Standard for Blower and Exhaust Systems for Vapor Removal, NFPA No. 91-1961, where applicable and also conform to the provisions of 1910.107. | NFPA 91-1961 Standard for the Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying (ANSI Z33.1-61). |
| 29 CFR 1910.261(a)(3)(ix) | Employers subject to the regulations at 1910.261 must comply with American National Standards Institute, Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying, Z33.1-1961. | ANSI Z33.1-61 Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying.1 |
| 29 CFR 1910.261(f)(5) | Employers must ensure that measures for the control of dust shall be provided, in accordance with American National Standards Z33.1-1961, Z87.1-1968, and Z88.2-1969. | ANSI Z33.1-61 Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying.1 |
| 29 CFR 1910.265(c)(20)(i) | Employers must ensure blower collecting and and exhaust systems are designed, constructed, and maintained in accordance with American National Standards Z33.1-1961 (For the Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying) and Z12.2-1962 (R1969) (Code for the Prevention of Dust Explosion in Woodworking and Wood Flour Manufacturing Plants). | ANSI Z33.1-61 Installation of Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying.1 |
| 1ANSI Z33.1 was superseded by NFPA 91. | ||
Standards are available for purchase from the American National Standards Institute (ANSI), see webstore.ansi.org, and from the National Fire Protection Association (NFPA), see catalog.nfpa.org.