CSA ANSI Z21.10.1b-2011/CSA 4.1b-2011
Addenda 2 to ANSI Z21.10.1-2009/CSA 4.1-2009, Gas water heaters – Volume I, storage water heaters with input ratings of 75,000 Btu per hour or less
Amendment by CSA Group, 12/01/2011
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