List at least three common chimney problems that must be checked.
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2. obstruction
3. u...
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Q14: Which of the following occurs when all
Q15: When does secondary air combine with gas?
A)before
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
Q21: Asbestos-cement piping is considered a hazardous material
Q22: What three things are required for combustion
Q23: Dryer lint is not flammable.
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