CAI-NJ AprilPROOF2.pdf

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A P R I L , 2 0 1 7
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loss as this will cause the homes air con-
ditioning system to work harder to make
up for the lost cool air. In extreme cases,
such as when the attic has very limited
open soffit ventilation, the pressure creat-
ed by the fan to draw of air into the attic
creates a negative pressure environment
within the home. Negative pressure in
a home can be harmful and ideally,
the home should have a slightly posi-
tive interior pressure. Negative pressure
within the home can pull excessive mois-
ture from the exterior into the building
envelope through the floors, walls and
roof assembly. Negative pressure can
also cause a backdraft of exhaust air
from combustion appliances, such as
older non-direct vent gas fired furnaces
and water heaters. Most attic fans now
have warnings in their installation guide-
lines regarding potential back drafting
issues that may occur when the fans are
installed near combustion appliances.
Many older model homes have make
up air ductwork between laundry and
mechanical closets that provide a direct
pathway from the combustion applianc-
es to the attic space.
Passive Ventilation System
In a “passive” ventilation system, air
movement is provided by the natural
convection of air that causes warm air
to rise. A properly designed passive
ventilation system consists of an equal
amount of upper ridge/dome vents
and lower vents at the eave or soffit.
As the warm air escapes out of vents
installed at the ridge, cool air is pulled
in through the lower soffit vents. This
creates an even amount of ventilation
throughout the entire attic space.
Passive ventilation is often preferred
as it can function through all sea-
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