__________ appliances draw in outside air for combustion and then exhaust the flue gasses directly back out of the structure.
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Q22: Match the gas to its typical pressure.
Q23: List four types of ignition on residential
Q24: Match the gas to its typical pressure.
Q25: What is the efficiency rating of a
Q26: The _ rating of fossil-fuel heating appliances
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Q31: List the three items that are necessary
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