Though attractive from many perspectives, DOAS/VRF systems do have drawbacks. First, with increased use of refrigerants, safety is a consideration. Calculations are required to verify occupants are not exposed to more than the allowable concentration of refrigerant (see “Applying Refrigerant Codes” by Greg Cunniff, PE, December 2013). Safety measures, such as refrigerant monitors, air-transfer ducts, and dampers, may be required. VRF systems generally are available for ...

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