CSA C22.2 NO. 104:20

Preface This is the harmonized CSA Group and UL Standard for Humidifiers . It is the fifth edition of CSA C22.2 No. 104, and the sixth edition of UL 998. This edition of CSA C22.2 No. 104 supersedes the previous edition(s) published on April 25, 2011. This edition of UL 998 supersedes the previous edition(s) published on April 25, 2011. This harmonized standard has been jointly revised on July 5, 2022. For this purpose, CSA Group and UL are issuing revision pages dated July 5, 2022. This harmonized Standard was prepared by CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Air Conditioning and Refrigeration Institute (ARI) and the Heating, Refrigerating and Air Conditioning Institute of Canada (HRAI) are gratefully acknowledged. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. This Standard was reviewed by the CSA Subcommittee on Humidifiers, under the jurisdiction of the CSA Technical Committee on Consumer and Commercial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA 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 These requirements cover humidifiers rated 600 V or less, and intended to be used in accordance with the National Electrical Code (NEC), ANSI/NFPA 70, and the rules of CSA C22.1, Canadian Electrical Code (CEC), Part I. 1.2 These requirements cover humidifiers intended for residential and commercial use. This includes humidifiers of the centrifugal atomizing type, evaporative-media type, water-injection type, steam type, and the like. The humidifiers are intended for installation in a room, mounted on a wall or a ceiling, or for duct or plenum mounting. 1.3 These requirements apply to equipment that includes an electric heating element to heat air or water, or both. 1.4 These requirements do not apply to evaporative coolers that are also intended to be used for cooling. 1.5 These requirements do not apply to portable, electrode-type products, such as vaporizers, which are covered by UL 499 and CAN/CSA-C22.2 No. 64.11.