2/4/2016
100
Mechanical Systems
• Forced-air systems
move air throughout
the building
• Exhaust systems
create negative
pressure zones
• Duct leakage can
create unintended
pathways and
pressure zones
Occupant Activities
• Positive pressure
exerted on windward
side
• Negative pressure on
leeward side
• Can be more
substantial with higher
building leakage
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