Health-care patient-room design is dictated by rigid environmental and safety requirements, which severely limit the types of systems deemed suitable for HVAC. These requirements are evaluated continually, which, on occasion, opens the door to more progressive and lower-energy technologies. Such a time was 2011, when ASHRAE revised ANSI/ASHRAE/ASHE Standard 170-2008, Ventilation of Health Care Facilities, with the publication of Addendum h, allowing the use of recirculating-type heating and ...

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