During the past several years, considerable time and effort have
been devoted to energy conservation of buildings. The results of
these efforts have been very positive and research is continuing
to further reduce the energy consumed in buildings.
A major source of energy wastage in commercial and industrial
buildings is the leakage of outside air through fresh
and exhaust air dampers. Conventional low leak dampers,
although an improvement over standard dampers, are still
responsible for considerable air leakage. The low leakage
claims made by manufacturers of these dampers, although
substantially accurate under laboratory conditions, are far
from representing field situations. Actual field measurements
through banks of conventional low leak dampers have shown
leakage in excess of 10% to 15% to be a common occurrence.
Damage occurring to conventional dampers during
shipment and the twisting of the shaft driving the damper
blades from the actuator to the opposite side of the damper
bank, are two of the reasons why leakage through banks of
conventional dampers is so much higher than what laboratory
results indicate.

The EBA approach to stop air leakage through fresh and
exhaust air dampers is a revolutionary disc damper that
results in air leakage of less than 0.001% at 4” differential
static pressure (0.001% at 10” optional).
Close monitoring of several buildings retrofitted with the
EBA dampers confirm the virtual leakproof properties of this
innovative design. Their normal pay back period associated
with retrofitting buildings with the EBA Positive Seal
Damper has proven to be approximately one year. It follows
that positive seal dampers in new buildings are that much
more attractive economically. More and more building owners
are insisting that their buildings be equipped with the
EBA Positive Seal Dampers.
The industrial version of these dampers have also been used
with excellent results to stop air leakage in laboratory chemical
exhaust hoods and in clean room applications.

Less than 0.001% of normal rated airflow at 4” differential
static pressure. By far the lowest leakage rate obtainable
with any commercially built damper. Unlike straight blades,
there are no end seals to leak.