Which of the following deficiencies is a common defect of combustion venting systems?
A)Noises in the heating system
B)Smoke from the heating system
C)Burn marks on the furnace
D)All of the above

Question

Quizplus · Accepted Answer

All of the above are common defects of combustion venting systems. You might hear squealing or rattling noises when the furnace kicks on, is running, or turns off. In some instances, the furnace might emit smoke. Or, there might be burn marks if there is insufficient ventilation.

Which of the Following Deficiencies Is a Common Defect of Combustion