CSA Z316.5:25

Preface This is the fifth edition of CSA Z316.5, Fume hoods and associated exhaust systems . It supersedes the previous editions published in 2020, 2015, 2004, and 1994. The following are the major changes to this edition: a) requirements for special application fume hoods have been added to Clause 4.5; b) requirements for fume hoods that will be used with a high heat load have been added to Clause 9.4.3.3; c) acceptable usage of the different classes of fume hoods has been added to Clause 9.6.6; d) guidance for cross drafts above 50% of the face velocity has been added to Clause 9.8.3.6; e) the requirement to investigate any change to the supply air or exhaust system parameters that might affect the ability of the fume hood to protect users has been added to Clause 10.1.3; f) additional requirements for the content of the training program have been added to Clause 11.2; g) Annex A on exhaust snorkels and canopy hoods has been revised to further explain the proper use of these devices; h) Table F.1 on training topics and safe operating practices for fume hood users and maintenance staff has been revised; and i) a new informative annex on fume hood energy efficiency (Annex D) has been added. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of the governments of Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Northwest Territories, Nova Scotia, Nunavut, Ontario, Prince Edward Island, Québec, Saskatchewan, and Yukon, as administered by Canada’s Drug Agency. This Standard was prepared by the Subcommittee on Fume Hoods, under the jurisdiction of the Technical Committee on Medical Laboratory Quality Systems and the Strategic Steering Committee on Health and Well-Being, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 1.1 Applicability of standard to laboratory fume hoods This Standard applies to all types of laboratory fume hoods, including ductless fume hoods. Note: Ductless fume hoods should not be considered acceptable substitutes for ducted fume hoods. They may be suitable alternatives provided there is an application-specific review (i.e., risk assessment) and written approval by the manufacturer. Some jurisdictions prohibit the use of ductless fume hoods with certain chemicals. 1.2 Specifications This Standard specifies a) safety requirements for fume hoods, their users, and service personnel; b) requirements for fume hoods, including the supply and exhaust system design and construction; c) requirements for fume hood placement; d) test methods for assessing fume hood performance; e) requirements for the selection, use, and maintenance of fume hoods; f) requirements for the education and training of fume hood users and maintenance personnel; g) requirements regarding information to be exchanged between suppliers and users of fume hoods to ensure installation, function, and maintenance are compatible with the intended use; and h) requirements for commissioning. Notes: 1) Users of this Standard should note fume hood requirements are also established by AHJs. 2) Other fume hood requirements can be found in the National Building Code of Canada, the National Fire Code of Canada, the Canadian Environmental Protection Act, and CNSC REGDOC-2.5.6. 1.3 Exclusions This Standard does not address detailed design considerations, such as hood design, fan selection, and duct/stack velocities. This Standard does not apply to biological safety cabinets. Notes: 1) Requirements applicable to the installation and field testing of biological safety cabinets can be found in NSF/ANSI 49. 2) This Standard is not intended to be used by manufacturers for the certification of their fume hoods. 1.4 Terminology In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 1.5 Units of measurement The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.