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ANSI Z21.13-2004/CSA 4.9-2004

Gas-Fired Low Pressure Steam and Hot Water Boilers

This standard applies to newly produced gas-fired low-pressure steam and hot water boilers with gas inlet pressure ratings not exceeding 1/2 psi (3.5 kPa) and having input ratings of less than 12,500,000 Btu per hour (3 663 389 W).

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