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What is the minimum clearance required between an exhaust flue on a conventional oil furnace and combustibles?

  1. 6 inches

  2. 9 inches

  3. 12 inches

  4. 15 inches

The correct answer is: 9 inches

The minimum clearance required between an exhaust flue on a conventional oil furnace and combustibles is 9 inches. This requirement is in place to ensure safety and prevent fire hazards, as flues can become very hot during operation. The clearance allows for heat dissipation, reducing the risk of igniting nearby combustible materials, such as wood or insulation. Having this specified distance also supports proper venting of gases, which is vital for the efficient operation of the furnace. All building codes emphasize the importance of maintaining clearances to ensure that all installations are safe for the occupants and the structure. Thus, the 9-inch clearance provides a balance between safety and effective functionality of the heating system.