Table 2-11 Minimum Ventilation Air Changes/Hr
Type of Rooms
Air Changes/Hr
Electrical Equipment Rooms
8
Mechanical Equipment Rooms
without steam service
8
components, such as, PRV
station, flash tank, heat
exchangers, condensate pumps,
etc.
Mechanical Equipment Rooms with
20
steam service components
Chiller Plants
See Article 2.12
(c) The unfiltered outdoor air shall be directly admitted to the above rooms
via motorized dampers, connected to the outdoor air louvers. The exhaust fans
ducted or otherwise, shall discharge the room air outdoors. Locate the intake
and exhaust air louvers as far as possible and, if possible, at diagonally
opposite ends, to ensure complete sweep of the air.
(d) Provide heating in these rooms to maintain the design temperature noted
in Article 1.3, by thermostatically controlled terminal heaters, such as unit
heaters. The sequence of operation shall be such that the heating system and
ventilation system will not operate at the same time.
2.10.4 TRASH COLLECTION AREAS
and maintain negative pressure in the room.
2.10.4.2 SYSTEM CHARACTERISTICS
(a) The ventilation system shall run continuously.
(b) The ventilation system for this area can be connected to the building
general exhaust system if the location of the trash collection area permits
such a tie-up. Alternately, provide a dedicated exhaust system.
(c) Depending upon the architectural layout, the ventilation system may use
the building air fully or partially as a make-up for the exhaust. For a fully
closed trash collection room, the use of the corridor air as a make-up is not
permitted.
(d) Provide thermostatically controlled heat to maintain 10 degrees C (50
degrees F) in winter in the trash collection area.
2.10.5 ELEVATOR MACHINE ROOMS
2.10.5.1 GENERAL
Following design conditions must be maintained in the machine rooms for safe
operation of elevators.
Summer: 36 degrees C (94 degrees F) or lower
Winter: 10 degrees C (50 degrees F)
HVAC DESIGN MANUAL
2-26
HVAC SYSTEMS AND EQUIPMENT
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