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18-28-403.3.7  Air-to-air heat recovery and air energy transfer equipment.
   Air-to-air heat recovery and air energy transfer equipment and systems intended to recover either sensible heat (dry bulb temperature), latent heat (humidity ratio) or enthalpy (total heat) may be used if the equipment or system is connected to an exhaust system from which recirculated air is permitted. For systems which require all air to be exhausted directly to outside, such heat recovery may only be used if there is no more than 5% (five percent) communication between outside air and exhaust air for Class I or Class II air as defined by ASHRAE 62.1. All other applications shall be approved by the committee on standards and tests in accordance with Chapter 13-16 of this Code.
(Amend Coun. J. 9-14-16, p. 31143, § 9)
18-28-403.3.7.1  Materials and media.
   No equipment or system that makes use of air-to- air heat recovery and air energy transfer, shall be used unless all of the following requirements are met:
   1.   The materials used therein are non-combustible; and
   2.   The heat transfer media are non-toxic and nonflammable.
18-28-403.3.7.2  Direct exposure of heat transfer media.
   Any equipment or system which exposes heat transfer media in succeeding cycles directly to exhaust air and to air from the outside atmosphere shall not be connected to any exhaust systems from which recirculated air is forbidden under this chapter. The exhaust discharge outlet location shall conform in all respects to the requirements of this chapter.
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