Mechanically
actuated
rectangular
damper
Isolation
dampers can be
manufactured and
tested to 18kPA+
in bag out filter housings
and systems, but soon
their high-end customers were
clamouring for the same.
Applications engineer Mark Bamforth
explains “Critical ventilation
applications commonly need a safe
system whereby the associated pre
and/or HEPA filters can be replaced
in isolation, either to protect the
environment and the operators from
toxic or active particles present in the
air stream, or to protect the process
from contamination by outside air. To
affect these filter changes safely while
allowing critical systems to continue
to operate, each filter system must
be individually isolated. Commonly
available dampers were found to
have too high a leakage rate for such
critical and high flow applications.
This was leading to overly expensive
depression relief systems or the
need to isolate a complete filter bank
which often necessitated an inefficient
and complicated complete system
shutdown.”
Because of the extensive
use of their filters and
housings in the nuclear industry,
M C Air Filtration dampers have to
meet the most rigorous of standards
far beyond those of others available
on the market. Each isolation damper
is manufactured and individually
factory tested under strict quality
controlled conditions in accordance
with the company’s BS EN ISO 9001
accreditation and allocated with
a unique serial number for future
traceability. MCAF dampers are
also routinely pressure tested and
certified to ensure they are leak free
at pressures of up to 12KPa and can
be manufactured and tested to 18 kPa
plus.
sided with radiused corners. Dampers
have been manufactured up to
1000mm in diameter and 1000mm
square.
Alongside the success of the original
circular isolation damper, MCAF now
also produces a rectangular series
butterfly isolation damper suitable for
installation into square and rectangular
ductwork. This range was developed
using the same design principles,
however the body and blade are flat
Recent projects include the supply of
over 400 multiblade isolation dampers
to a major new biotech facility in
London, a nuclear decommissioning
project in Scotland and work at the
forefront of Britain’s development of
nuclear fusion.
Conventional square and rectangular
section ultra-low leakage or zero
leakage multi-blade isolation dampers
are also manufactured by the Kentbased firm in either coated carbon
or stainless steel. These products
generally feature multiple spring
loaded self-compensating blades fitted
with a silicone rubber blade seals that
are mechanically compressed against
the damper frame. The differential
pressure difference across the damper
blade also aids closure and sealing of
the blades.
M.C. Air Filtration Ltd.
E X C E L L E N C E I N A I R F I L T R AT I O N
MOTNEY HILL ROAD
T: +44(0) 1634 388333
GILLINGHAM
KENT
E: [email protected]
ME8 7TZ
www.mcaf.co.uk
Issue 18 PECM
11