Final answer:
Type B vent is used for venting appliances that burn natural gas or propane, such as certain heaters and furnaces, making option 1 correct. It is not suitable for appliances that burn wood, coal, oil, or gasoline which require other venting solutions.
Step-by-step explanation:
Type B vent is used for venting a listed or approved appliance equipped to burn natural gas or propane. Therefore, the correct answer to the question is option 1. Type B vents are double-walled pipes commonly used with certain heating appliances. They are not suitable for appliances that burn wood, coal, oil, or gasoline. For those appliances, other types of venting systems are required that can handle the higher temperatures and different combustion byproducts.
When speaking of combusting propane, it is important to balance the combustion equation. Propane (C3H8) burns in oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation is: C3H8 (l) + 5O₂(g) → 3CO₂(g) + 4H₂O(l).