CSA/ANSI Z83.7:23 • CSA 2.14:23

1 Scope 1.1 Applicable equipment 1.1.1 Specific heaters This Standard applies to newly produced, direct-fired and indirect-fired construction heaters, hereinafter referred to as heaters, constructed entirely of new, unused parts and materials and primarily intended for temporary use in heating buildings or structures under construction, alteration, or repair. Products of combustion generated by direct-fired heaters are vented into the area being heated, whereas products of combustion generated by indirect-fired heaters are vented to the outdoors. Direct fired heaters may be installed indoors and optionally outdoors. Indirect-fired heaters may be installed indoors, outdoors, or both. Direct ground thawing heaters are for outdoor use only where heat is directed into the ground. The requirements of this Standard cover heaters with rated inputs up to and including 10 000 000 BTU/h (2930 kW). 1.1.2 Connection to ducts This Standard applies to self-contained heaters with or without integral means for air circulation and may be intended for connection to ducts. If a heater is designed to be utilized with ductwork, the heater is to be tested with the ductwork recommended by the manufacturer or at the maximum static pressure specified by the manufacturer. 1.1.3 Universal construction heaters This Standard applies to universal construction heaters (see Clause 3). 1.1.4 Fuel types for heaters This Standard applies to heaters for use with the following fuel types: a) natural gas; b) propane gas in the vapour phase; and c) propane gas in the liquid phase when the heater i) incorporates an integral vaporizer that meets the requirements outlined in Clause 6.7; and ii) meets all requirements for heaters for outdoor use outlined in Clause 5.19. 1.2 Non-applicable equipment This Standard does not apply to heaters employing a flameless catalytic combustion process. This Standard does not apply to heaters for use with liquid-phase fuel gases, except when the heater is for use with liquid propane and incorporates an integral vaporizer as outlined under applicable fuel types in Clause 1.1.