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CSA ANSI 3.21:19

Industrial gas-fired natural draft heaters for installation in non-hazardous and hazardous locations in oil and gas process applications
standard by CSA Group, 03/01/2019

CSA 4.3B-2000

Addenda 2 to ANSI Z21.10.3-1998/CSA 4.3-M98 and ANSI Z21.10.3A-2000/CSA 4.3A-M00, Gas Water Heaters – Volume III – Storage Water Heaters with Input Ratings Above 75,000 Btu Per Hour, Circulating and Instantaneous
standard by CSA Group, 01/17/2001

CSA 6.23A-M97

Addenda 1 to ANSI Z21.77-1995/CGA 6.23-M95, Manually Operated Piezo-Electric Spark Gas Ignition Systems and Components
standard by CSA Group, 11/01/2000