ULC ANSI/CAN/UL/ULC 4402:2024

Preface

This is the First Edition of ANSI/CAN/UL/ULC 4402, Standard for Indoor Air Quality in Buildings and Facilities Utilized for the Cultivation, Production and Processing of Cannabis.

UL is accredited by the American National Standards Institute (ANSI) and the Standards Council of Canada (SCC) as a Standards Development Organization (SDO). ULC Standards is accredited by the Standards Council of Canada (SCC) as a Standards Development Organization (SDO).

This Standard has been developed in compliance with the requirements of ANSI and SCC for accreditation of a Standards Development Organization.

This ANSI/CAN/UL/ULC 4402 Standard is under continuous maintenance, whereby each revision is approved in compliance with the requirements of ANSI and SCC for accreditation of a Standards Development Organization. In the event that no revisions are issued for a period of four years from the date of publication, action to revise, reaffirm, or withdraw the standard shall be initiated.

Annex A, identified as Informative, is for information purposes only.

In Canada, there are two official languages, English and French. All safety warnings must be in French and English. Attention is drawn to the possibility that some Canadian authorities may require additional markings and/or installation instructions to be in both official languages.

Comments or proposals for revisions on any part of the Standard may be submitted at any time. Proposals should be submitted via a Proposal Request in the On-Line Collaborative Standards Development System (CSDS) at https://csds.ul.com.

Our Standards for Safety are copyrighted by ULSE Inc. Neither a printed nor electronic copy of a Standard should be altered in any way. All of our Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of ULSE Inc.

This Edition of the Standard has been formally approved by the Technical Committee ( TC) on Indoor Air Quality In Buildings And Facilities Utilized For The Cultivation, Production And Processing Of Cannabis, TC 4402.

This list represents the TC 4402 membership when the final text in this standard was balloted. Since that time, changes in the membership may have occurred.

Scope

1.1 This Standard provides minimum indoor air quality (IAQ) requirements and guidelines for a building or portions of a building utilized for cannabis cultivation, post-harvest processing as well as ancillary spaces.

Note: For the purposes of this Standard, ancillary spaces include areas that support the general operations required to run a cannabis facility. Examples include but are not limited to: Corridors, HVAC/Mechanical Rooms and Electrical Rooms.

1.2 This Standard recognizes the issues surrounding lead paint and asbestos in the built environment. Due to differing legal restrictions and licensure requirements, these materials are beyond the scope of this standard. It is the responsibility of the building owner and/or operator to assure compliance with all regulations applicable within the jurisdiction.

1.3 This Standard does not address: fumigation and insecticidal fogging, ozone generating air cleaning devices, ultraviolet germicidal irradiation (UVGI) exposure from air cleaning devices, nor exposure limits for hydrofluoroalkane (HFA-134a).

1.4 This Standard does not address cannabis related biogenic volatile organic compounds (BVOCs). These BVOCs include thiols (also called volatile sulfur compounds, or VSCs) as part of their natural biological cycles. The VOCs emitted by cannabis include terpenes with main constituents as isoprene, monoterpenes and sesquiterpenes. These terpenes are odorants with extremely low odor thresholds. At the time of this publication, the STP is not aware of any evidence that suggests health hazards are related to cannabis BVOC emissions at the typically observed concentrations.

1.5  This Standard does not include provisions for greenhouses.