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At what temperature difference between inside and outside of a duct is insulation typically required?

  1. 5°F

  2. 10°F

  3. 15°F

  4. 20°F

The correct answer is: 15°F

Insulation is typically required when there is a significant temperature difference between the inside and outside of a duct to prevent heat loss or gain and maintain the desired temperature of the air flowing through the duct. A temperature difference of 15°F is significant enough to warrant the need for insulation to ensure energy efficiency and consistent indoor comfort. Options A, B, and D have temperature differences that are not as substantial and may not require insulation as a result.