Gas Heat ESCO Practice Exam

When venting Category I furnaces, it is sometimes necessary to increase the vent pipe size. The proper location to adapt to the larger vent is:

1. At the furnace connection

2. At the roof line

3. In the middle of the vent run

4. Near the vent cap

The correct answer is: At the furnace connection

When venting Category I furnaces, it is important to have proper air flow and ventilation in order to ensure efficient and safe operation. This can be achieved by increasing the vent pipe size, but the question asks specifically about the location for adapting to a larger vent. The answer is A, at the furnace connection, because this is where the increased size will have the greatest impact on air flow and prevent potential buildup of dangerous gases. Adapting at the roof line (option B) is not recommended as it could cause decreased air flow and back drafting. In the middle of the vent run (option C) would create an uneven flow of air and may not effectively remove harmful gases. Near the vent cap (option D) would not have the same impact on air flow as adapting at the furnace connection.