Which of the following statements about duct leakage losses is true?
a. The effects of air leakage in supply air ducts are the same as those in return ducts
b. For insulated supply air ducts located within the conditioned spaces, determination of air leakage into the conditioned space is difficult and can only be evaluated by judgment
c. Leakage inspection can only be done after the duct is covered in insulation
d. Losses from bare supply air ducts within the conditioned space have a substantial impact on loss calculations
e. Air leakage varies from 40% to 45%
Answer: B