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CSA Z21.10.3a-2007/CSA 4.3a-2007
Addenda 1 to ANSI Z21.10.3-2004/CSA 4.3-2004, Gas Water Heaters - Volume III, Storage Water Heaters With Input Ratings Above 75,000 Btu Per Hour, Circulating and Instantaneous
Amendment by CSA Group, 10/01/2007