LG GD1329CGU Service Manual page 45

FORCED MULTIPLE VENTING SYSTEM
Use adjust damper to fit airflow velocity 5m/s at exit
Gas
Dryer
Exhaust duct
Blower
(Suction fan)
Exhaust
duct
45
Adjust
Damper
Main
Exhaust
Duct
Outdoor
(Exit)
Air flow
velocity
:5m/s