ANSI Z21.96:2019 pdf free download – Portable water heaters for outdoor use
1.12 This Standard contains SI (Metric) equivalents to the yard/pound quantities, the purpose being to allow the Standard to be used in SI (Metric) units. (IEEE/ASTM SI 10, American National Standard for Metric Practice, or ISO 80000-1:2009, Quantities and units — Part 1: General, is used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and a corresponding value in other units are stated, the first stated value is to be regarded as the requirement. The given corresponding value may be approximate. If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both shall be provided.
1.13 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.
Automatic gas shutoff system — a system consisting of an automatic gas shutoff device and an automatic gas shutoff valve constructed so the attainment of a water temperature in excess of some predetermined limit acts in such a way as to cause the gas to the main burner(s) of the appliance to be shut off. It may also shut off the gas to the pilot burner. Automatic gas shutoff valve — a valve used in conjunction with an automatic gas shutoff device to shut off the gas supply to a gas-fired water heating system. It may be constructed integrally with the gas shutoff device, or be a separate assembly. Automatic valve for gas appliances — an automatic or semi-automatic device consisting essentially of a valve and operator that controls the gas supply to the burner(s) during normal operation of an appliance. The operator may be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other means. Semi-automatic valve — a valve that is opened manually and closed automatically, or vice versa. Baffle — an object placed in an appliance to change the direction of or retard the flow of air, gas-air mixtures or flue gases. BTU — abbreviation for British Thermal Unit. The quantity of heat required to raise the temperature of 1 pound of water 1°F. Burner — a device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.