(5) The use of HEPA filters in the 100 percent exhaust from the TB
isolation suite is not necessary, but its use should be considered
whenever exhaust air could possibly reenter the system.
(6) Whenever the project requires winter humidification and perimeter
heating, they shall be included in the system design. Note that the winter
humidity control is not required on a room-by-room basis but only at the
air handling unit level. The perimeter heating control shall be integrated
with the room temperature control so that only the room thermostat
controls the air reheat and the perimeter heat in sequence.
3.22.5.3 EXHAUST AND INTAKE OUTLETS: Air exhausted to the outdoor as a
method of reducing the risk of transmission of tuberculosis should be
exhausted in a manner and at a location so as not to be pulled into air
intake louvers. As a minimum, the exhaust air discharge shall be 30 feet
from any air intake. However, other factors, such as wind direction, wind
velocity, stack effect, system sizes and height of building, must be
evaluated in the location of air intakes and exhaust outlets. Refer to
Chapter "Air Flow Around Buildings" of ASHRAE Fundamentals Handbook for
analyzing these factors.
HVAC DESIGN MANUAL
3-31
HVAC REQUIREMENTS FOR OCCUPIED AREAS
Previous Page
