cylinders, shall be ventilated in accordance with the criteria outlined in
Article 4.5, Flammable and Combustible Liquid Storage Spaces.
3.18
PSYCHIATRIC AREAS
3.18.1 INDOOR DESIGN CONDITIONS
Summer: 24 degrees C (76 degrees F) Db, 50 percent RH
Winter: 25 degrees C (78 degrees F) Db, 30 percent RH
3.18.2 SUPPLY AIR
Maintain a minimum of 4 air changes per hour in Patient Rooms.
3.18.3 SPECIAL CONSIDERATIONS
The considerations listed below may be applicable to the complete
psychiatric areas or only a few designated seclusion rooms. Coordinate
details with the VA.
(a) Avoid the use of exposed and accessible HVAC equipment in patient
areas. Examples: floor mounted fan coil units, radiators, convectors, and
finned tube radiation, etc.
(b) Exposed piping shall not be used.
(C) Use an aspirating thermostat or a duct mounted temperature sensor
programmable from a remote control panel. Seclusion rooms shall be
provided with individual temperature controls.
(d) If the radiant ceiling panels system is used:
(1) Maintain the ceiling height as high as possible.
(2) Do not use conventional lay-in tile ceiling construction. Use
concealed snap in arrangement.
(3) Use security clips to retain ceiling panels in place against possible
damage by patients.
(e) Wall-mounted or security type ceiling-mounted diffusers, grilles and
registers are preferred in psychiatric wards. Coordinate the selection of
grilles, registers, and diffusers with the medical center.
3.18.4 EXCEPTION
The above requirements are not applicable to long-term geriatric patients
who are not prone to violent temperamental behavior.
3.19 SHIELDED ROOMS
3.19.1 GENERAL
Coordinate locations of the shielded rooms with the architectural floor
plans.
3.19.2 LEADED SHIELDED DUCT REQUIREMENTS
(a) Ducts penetrating lead-lined walls should be wrapped with lead sheet
of the same thickness as the wall lining. The lead shielded duct passing
HVAC DESIGN MANUAL
3-20
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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