ANSI Z83.4-2017/CSA 3.7-2017 pdf free download.Non-Recirculating Direct Gas-Fired Heating And Forced Ventilation Appliances For Commercial And Industrial Application.
This Standard applies to newly produced non-recirculating direct gas-fired heating and forced ventilation appliances, hereinafter referred to as heaters, whose purpose is to address building infiltration, replace building air that is exhausted, offset building conduction heat loss and provide outside air ventilation. All air to the heater is ducted directly from outdoors and the products of combustion generated by the heater are released into the air stream being heated.
Heaters covered by this Standard are intended for use in industrial and commercial applications.
Heaters covered by this Standard are not intended for use in any area containing sleeping quarters. The installation conforms with local codes. or in the absence of local codes, in ccordance with the National Fuel Gas Code, ANSI Z223. 1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.1.
In this Standard, shall”is used to express a requirement, i.e., a provision that the user shall satisfy in order to comply with the standard; “should ” is used to express a recommendation or that which is advised but not required andmay “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.