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A vented floor furnace must have a trap door not less than how many square feet?

  1. 3

  2. 4.6

  3. 5

  4. 6

The correct answer is: 4.6

A vented floor furnace requires a trap door that is no less than 4.6 square feet to ensure adequate access for maintenance and safe operation. This size standard helps to facilitate sufficient airflow for combustion and provides a safe means of access for servicing the furnace. The dimensions are established by safety codes and regulations to mitigate risks associated with vented floor furnaces, which can include combustion gas leaks or airflow issues if access is restricted. Proper access not only ensures maintenance can be performed without hindrance but also helps in verifying that the furnace is operating correctly and safely, which is crucial for both performance and safety within the environment it serves. The other options, while varying sizes, do not meet the standard requirement and would not provide the necessary safety and functional benefits outlined in the building codes.