Appendix C 423
7 Pollutants emitted from strong sources may need to be exhausted
directly to outdoors. Combustion products from appliances should
be vented to outdoors. The rates of air exhaust from janitor storage
rooms and restrooms should be sufficient to maintain these rooms
depressurized relative to surrounding rooms and the air should
be exhausted directly to outdoors. Equipment with high emission
rates of pollutants or odors should be isolated in rooms (e.g., copy
machine rooms or kitchens) with high air exchange rates with
air exhausted directly to outdoors. These rooms should also be
maintained depressurized. Parking garages should be physically
separated from occupied spaces and maintained under negative
pressure relative to the adjoining occupied spaces.
8 Mechanical equipment rooms should not be used for storage of
building materials, solvents, cleaning supplies, pesticides, adhe-
sives, or other pollutant- or odor-emitting materials.
9 During building construction and major renovation projects, un-
usually strong sources of particles and VOCs may be present in
the building. (Products or processes with low pollutant emissions
should be employed when feasible.) Occupants must be isolated
from these sources of pollutants using temporary internal walls
as necessary and by maintaining the air pressure in the construc-
tion area less than the pressure in the adjoining occupied spaces.
Measures should be taken to ensure that ventilation systems
serving the construction zone do not become contaminated by
construction dusts, or the systems should be cleaned thoroughly
prior to occupancy (SMACNA 1995). A short delay (e.g., few days
to weeks) in the occupancy of newly constructed or renovated
spaces can help to prevent odor and irritancy complaints associ-
ated with the VOC emissions of new materials.
10 Good housekeeping practices should be employed to limit the ac-
cumulation of pollutants on surfaces and to reduce the potential
for microbiological growth on these surfaces.
5.1.2 Assuring Adequate Quality of Intake Air
Assuring adequate quality of intake air is essential. When pos-
sible, buildings should be located in areas with acceptable outdoor air