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Positive
Seal Dampers - commercial grade
We redefine the meaning
of "Low Leakage"
Introduction
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 representative
of field situations. Actual field measurements through banks of
conventional low leak dampers have show 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 M & I Approach
The M & I Heat Transfer 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 M & I dampers confirm
the virtual leak-proof properties of this innovative design. Their
normal pay back period associated with retrofitting buildings
with the M & I 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
M & I 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
air room applications.
Features
Extremely low leakage
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.
Positive flow control
The unique motion of the control disc allows for accurate
flow control minimum volumes. Pneumatic operators are installed
as standard equipment to provide control with standard instrument
air pressures; however, electric motors can be supplied upon request.
Normally open or closed operation can be provided.
Few moving parts
The linkage design has up to half the number of bearing
points of conventional dampers.
Easy installation
Factory mounted operators eliminate costly field installation
errors. Dampers can be easily screwed or riveted into place through
the extra wide 2" frame. Rigid lightweight design helps ensure
proper alignment because of stiffening provided by the orifice place
and torsion bar brace.
Long gasket life
Extruded neoprene material provides years of effective
service. M & I Heat Transfer Products Ltd. provides a ten-year
gasket material replacement warranty.
Subzero to high temperature
M & I offers specially designed silicone gasket suitable
for both subzero and high temperatures (-60 F to 500 F/51 C to 260
C)
Corrosion-resistant construction
Dampers are formed of galvanized steel and aluminum construction.
As an option, they can also be supplied in stainless steel or epoxy
coated construction. Nylon bearings on stainless steel shafts ensure
years of trouble-free operation.
Typical applications
Fresh air intake, return air damper, exhaust/relief air
damper, staircase pressurization, room isolation, roof exhaust
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