ANSI Z21.35-2005 (R2020)/CSA 6.8-2005 (R2020)

Preface This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of pilot gas filters for gas appliances. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on pilot gas filters for gas appliances designed for utilization of gas. There are risks of injury to persons inherent in appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this standard are intended to help reduce such risks while retaining the normal operation of the appliance. Nothing in this standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of pilot gas filters for gas appliances, the safety construction and performance of which may exceed the various provisions specified herein. In its preparation, full recognition has been given to possibilities of improvement through ingenuity of design. As progress takes place, revisions may become necessary. When they are believed desirable, recommendations or suggestions should be forwarded to the Chairman of Accredited Standards Committee Z21/83, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131, or the Chairman of the CSA Technical Committee on Gas Appliances and Related Accessories, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada, L4W 5N6. Safe and satisfactory operation of a pilot gas filter for gas appliances depends to a great extent upon its proper installation, use and maintenance. It should be installed, as applicable, in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54; the Natural Gas and Propane Installation Code, CSA B149.1. Users of this American National Standard/Canadian Standards Association Standard are advised that the devices, products and activities within its scope may be subject to regulation at the Federal, Territorial, Provincial, state or local level. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this standard, the Federal, Territorial, Provincial, state or local regulation should be followed. Scope 1.1.1 This standard applies to newly produced pilot gas filters, hereinafter referred to as filters (See Part IV, Definitions), constructed entirely of new, unused parts and materials. Compliance of a filter with this standard does not imply that the filter is acceptable for use on gas appliances without supplemental tests with the filter applied to the particular appliance design. 1.1.2 This standard applies to filters having maximum operating gas pressure ratings of 1/2 psi. 1.1.3 Filters complying with the provisions of this standard shall be considered as having an operating temperature range of 32°F to 125°F (0°C to 51.5°C). They may be capable of operation at a higher temperature, lower temperature, or both, when so specified by the manufacturer. 1.1.4 If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification. 1.1.5 All references to psi throughout this standard are to be considered gage pressures unless otherwise specified. 1.1.6 Exhibit A contains provisions that are unique to Canada. 1.1.7 Exhibit B contains a list of standards specifically referenced in this standard, and sources from which they may be obtained.