When does secondary air combine with gas?
A) before combustion
B) during combustion
C) after combustion
D) none of the above
Correct Answer:
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Q10: When an appliance is _ vented, fresh
Q11: Which of the following is produced by
Q12: What type of air is supplied through
Q13: Which category of appliances are positive vent
Q14: Which of the following occurs when all
Q16: Which category of appliances are nonpositive vent
Q17: Which category of appliances are nonpositive vent
Q18: Which of the following is a special
Q19: The principal products of combustion of any
Q20: Which of the following are a factory-made
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