What is the minimum distance Type B vent pipe must be kept from combustible materials?

The correct answer indicates that Type B vent pipe must be kept at least one inch away from combustible materials. This requirement is based on safety codes and standards that aim to minimize the risk of fire hazards associated with hot gases emitted by vent pipes used in HVAC systems.

The one-inch clearance is necessary because Type B vents can reach high temperatures, especially when in operation. By maintaining this minimum distance, you help ensure that heat does not transfer to nearby combustible materials, which could potentially ignite and cause a fire.

Furthermore, adhering to this clearance guideline also allows for proper ventilation, which is essential for the efficiency and effectiveness of the appliance being vented. Keeping the vent pipe at the correct distance not only contributes to safety but also promotes longevity and optimal performance of the HVAC system.