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NOTE 1 Opening must be 2-inches (5.08 cm) larger than the duct (all the
way around). The duct must be centered within this opening.
NOTE 2 Distance should be 2 times the diameter of the duct to the nearest
obstruction.
Single Dryer Venting
Important
For extended ductwork runs, the cross section
area of the ductwork can only be increased to an
extent. When the ductwork approaches the maximum
limits as noted in this manual, a professional HVAC firm
should be consulted for proper venting information.
Horizontal Venting
When horizontal dryer venting is used, the length of the
ductwork from the dryer to the outside exhaust outlet, must
not exceed Dimension A (30 feet [9.144 meters]). The
minimum diameter of this ductwork must be at least
Dimension B (8-inches [20.32 cm]). Including tumbler/dryer
elbow connections or elbows used for outside protection
from the weather, no more than 1 elbow should be used in
the exhaust duct run. If more than 1 elbow is used, the cross-
sectional area of the ductwork must be increased.
Vertical Venting
When vertical dryer venting is used, the length of the ductwork
from the dryer to the outside exhaust outlet, must not exceed
Dimension C (35 feet [10.668 meters]). The minimum
diameter of this ductwork must be at least 10-inches (25.4
cm) even though the dryer exhaust duct connection is only
Dimension D (8-inches [20.32 cm]). Including tumbler/dryer
elbow connections or elbows used for outside protection
from the weather, no more than 3 elbows should be used in
the exhaust duct run. If more than 3 elbows are used, the
cross-sectional area of the ductwork must be increased.
NOTE 1 Opening must be 2-inches (5.08 cm) larger than the duct (all the
way around). The duct must be centered within this opening.
NOTE 2 Distance should be 2 times the diameter of the duct to the nearest
obstruction.
Multiple Dryer (Common) Venting
Important
For extended ductwork runs, the cross section
area of the ductwork can only be increased to an
extent. When the ductwork approaches the maximum
limits as noted in this manual, a professional HVAC firm
should be consulted for proper venting information.
If it is not feasible to provide separate exhaust ducts for each
dryer, ducts from individual dryers may be channeled into a
“common main duct.” The individual ducts should enter the
bottom or side of the main duct at an angle not more than 45º
in the direction of airflow. The main duct should be tapered,
with the diameter increasing before each individual duct is
added. The minimum diameter of the individual ductwork
(Dimension A) must be at least 8-inches (20.32 cm).
Important
No more than 4 dryers should be connected to 1
main common duct.
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