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Introduction and Scope of ANSI Z21.79-1997
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Introduction and Scope of ANSI Z21.79-1997
ANSI Z21.79-1997, formally titled Gas-Fired Emergency and Standby Gas-Fired Air Heaters and Enclosure Heaters, is a foundational North American safety standard developed under the auspices of the American National Standards Institute (ANSI) in conjunction with the Canadian Gas Association (CGA). This standard specifically governs the construction, performance, and safety testing of gas-fired heaters designed for emergency, standby, and industrial enclosure applications, distinct from residential comfort heating appliances.
The 1997 edition outlines rigorous requirements for appliances operating on natural gas, manufactured gas, mixed gas, or LP gas. Key distinctions within the scope include:
- Emergency Heaters: Designed for temporary rapid deployment or dedicated installation where primary heating has failed.
- Standby Heaters: Fixed appliances that automatically maintain a set minimum ambient temperature.