To limit the probability that tempering devices will not function properly, which could lead to incoming cold outdoor air being distributed by the ductwork, which could lead to drafts, which could lead to the inadequate thermal comfort of persons, which could lead to harm to persons.
To expand the application of Articles 9.33.4.1. and 9.33.5.2. to the installation of duct heaters, heating coils, or other air-tempering devices for mechanical ventilation systems within the scope of Section 9.32.