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Option 2 - Vertical System
The vertical system is used in some apartment buildings that
have a washer and dryer on each floor. Each dryer is exhausted
into the same central vertical duct. See the following illustration
for an example of a generic vertical system.
A
F
B
C
F
A. 0.6" (1.5 cm) water column maximum back pressure
B. Weighted dampers
C. Individual dryer exhaust - on each floor
D. 0.1" (0.25 cm) water column maximum vacuum
E. Main duct
F. Barometric damper (use depends on exhaust
system design)
G. Source of outside air
Option 3 - Combination System
The combination system may be used in high-rise apartments,
with a bank of dryers installed at several different levels. Each of
these banks then exhausts into a central vertical vent. See the
following illustration for an example of a combination system.
D
E
F
G
A
B
C
A. Central vertical duct - maximum of 0.1"
(0.25 cm) water column vacuum
B. Weighted damper (each dryer)
C. Maximum of 0.6" (1.5 cm) water column
back pressure
D. Barometric damper (use depends on
exhaust system design)
E. Outside air source
E
D
5
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