CSA ANSI Z21.103-2017 Unvented portable type gas camp heaters for indoor and outdoor use.
4 Construction
4.1 General construction and assembly
Construction features and the quality of the workmanship shall be in conformity with acceptable engineering practices.
A heater shall be easy to light and operate without the danger of burning hands, when using normal precautions. The appliance shall be easy to handle without the danger of cutting hands, when using normal precautions.
A heater shall be of such construction as to be secure against displacement, distortion, warping, or other damage, and shall be supported to maintain a fixed relationship between essential parts under normal and reasonable conditions of handling and usage to comply with these provisions. Parts not permanently secured shall be designed so that parts cannot be incorrectly assembled and cannot be improperly located or misaligned in removing or replacing during use, cleaning, or other servicing.
If any indication is observed during the tests prescribed herein that the appliance will not continue to meet these provisions in normal usage, such supplementary tests shall be conducted that will provide safe and satisfactory service.
In submitting a heater for test, the manufacturer may furnish a list of manufacturing tolerances applicable thereto and may have the appliance tested for compliance with these requirements in both extremes of tolerances specified.
Fasteners shall be of corrosion-resistant material or shall have a metallic, corrosion-resistant coating suitable for the particular application.
Bolts, nuts, and screws, except sheet-metal screws, used in the general assembly of the heater shall have threads conforming with the Standard for Unqied Inch Screw Threads (UN and UNR Thread Form), ASME B1.1 or ASME B1.13M, Metric Screw Threads: M Profile.
Pipe threads shall conform with the Standard for Pipe Threads, General Purpose (Inch), ASME B1.20.1.CSA ANSI Z21.103 pdf download.