To limit the probability that HVAC system ducts and plenums will be inadequately insulated, which could lead to excessive thermal transfer through system components, which could lead to excessive use of energy for heating, ventilating and cooling, which could lead to an unacceptable effect on the environment.
To limit the probability of openings in joints and plenums of ducts, which could lead to excessive air leakage through system components, which could lead to excessive use of energy for heating, ventilating and cooling, which could lead to an unacceptable effect on the environment.