GSA Boiler Manual - Williamson-Thermoflo
2019-12-12 · Do not alter boiler draft hood or place any obstruc-tion or non-certified vent damper in breeching or vent system. CSA certificationwill become void. Flue gas spillage and carbon monoxide emissions will occur causing severe personal injury or death. The following requirements apply when you remove an existing boiler from a vent system
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