## How to approx. Total pressures and Flow (CFM)

Here is and Example.

There is a system with 2-20ft dia. fans, in parallel, pulling air through a bunch of cooling coils with a cross-sectional area of about 800 ft^2.

One fan is running and the other is isolated by backdraft dampers. In this situation the flow through the unit is 842,770 CFM and a total pressure (static + velocity) of 0.853" wg.

If the backdraft dampers on the second fan failed and air was allowed to enter through the second 20' Dia. by 10' high fan stack into the unit...how can I approx. the new total pressure inside the unit and the resulting airflow. Also what % of that air is coming through the coils and what % is coming through the open 'hole' in the unit?

Thanks for any input
aero
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