Answer Key: Self-Test A-3.3

    1. d. The difference in >densities of vent gases and ambient room air.
    2. d. A condition in which a draft is forced downward and can cause flue-gas spillage.
    3. b. False
    4. a. Allow for spillage
    5. c. 83%
    6. a. A draft produced by a mechanical device downstream from the combustion zone.

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