| http://www.w3.org/ns/prov#value | - This two-day course will:Cover how common residential gas, oil, and natural gas central space heating systems work.Explore the combustion process, chimneys, appliance types, operating and safety controls, vent safety, carbon monoxide and heat rise measurements, electricity, and fuel delivery.Train participants to perform tests on all types of gas and oil-fired systems and to recommend retrofits.Di
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