Vesta Stuttgart, User Manual

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pancake reducer. Reducing duct size will restrict airflow and
decrease airflow, thus reduce duct size as far away from opening
as possible.
If turns or transitions are required: Install as far away from
opening and as far apart, between 2, as possible.
The size of the vent should be uniform.
Use no more than three 90° elbows.
Make sure there is a minimum of 24” (61 cm) of straight vent
between the elbows if more than one elbow is used.
DO NOT install two elbows together.