TAB Journal Spring 2018 - 12
A Case for
As-Found Air Flow
Steve Koutsonicolas, P. Eng.
Caltab Air Balance, Inc.
Renovations to washrooms on three floors of a university building included the
upgrades to the existing ventilation system. The contract was for the rebalance of
the redesigned washrooms with new ductwork and exhaust grilles. The existing
rooftop exhaust fan was not in the contract.
preliminary balance of the system was required on the
second and third floors because the university wanted
to open these up to the public. The first floor was
incomplete. The initial exhaust airflow measurements by flow
hood resulted in a total of 215 CFM out of a design of 2280
CFM, or 9% of design, for the two floors. All dampers in the
duct work were inspected as well as the fire dampers. All were
found to be fully open.
TAB Journal Spring 2018