welldana D66-112015, Operation Instructions Manual, Page: 8 / 18

2.2 Installation continued
L)
Serial and parallel connected blowers feature:
Serial connection: (Pressure increases)
Model A
Pressure = 90% of (Model A + Model B)
Air flow = Model A
Model B
Parallel connection (airflow increases)
Model A
Pressure = Model A or Model B
Air flow = Model A + Model B
Model B
CAUTION
Blowers of different horse power can not be
connected with one another.