Applications
Many critical applications
in healthcare, science and high technology manufacturing require the highest
standards of air filtration. Microseal™ HEPA filters are manufactured to
the most exacting standards for such applications that include:
- cleanrooms
- hospital operating theatres
- biological containment laboratories
- laminar flow clean benches and
safety cabinets
- food processing plants
- research laboratories
Description
Conventional filters
A continuous sheet of special
microfine glass-fibre filter medium is pleated into a vee configuration
with corrugated aluminium separators inserted between the pleats. This
forms the filter element which is bonded into a rigid corrosion-resistant
steel frame with all joints encapsulated and sealed in a special urethane
elastomer. Filters for trace-metal laboratories are produced in ‘metal-free’
construction with wood frames and non-metallic separators. Standard filters
have a closed-cell neoprene gasket on the air-leaving side, and filters
for fluid seal installation have an extended frame with a 60mm skirt to
engage the sealant channel. Filters are produced in a wide range of face
dimensions and in two standard depths of nominally 150mm and 300mm.
Minipleat filters
These filters are of low-depth
construction and use very close pleating of the medium, with separation
of the pleats achieved by means of continuous, narrow beads of a special
hot-melt compound. Typically, a minipleat filter has similar airflow/pressure
drop characteristics to a conventional filter of the same face dimensions,
but has only one third of the depth of the conventional filter. Their
light weight and compact dimensions make them the preferred selection
for laminar flow cleanrooms and low-profile ceiling modules.
Performance
Each filter is individually
certified to achieve an arrestance efficiency of not less than 99.995%
to the stringent BS3928 Sodium Flame test. All testing is conducted
in a ISO-registered factory laboratory, and a ISO-endorsed test label,
being an extract of the test report, is affixed to each filter.
Installations
Standard filters are suitable
for conditions up to 115ºC and 100% RH. Fluid seal filters are suitable
for use up to 55ºC. ‘Type’ testing has shown that Microseal™ filters
can safely withstand static pressures up to 2.5 kPa. However, in most ventilation
applications, filters are selected to operate at much lower pressures,
and are replaced when dictated by system fan performance, or at a specified
final resistance. In typical laminar flow systems, filters have an initial
resistance of 120-130 Pa, and are replaced if non-uniform airflow characteristics
are observed or when increased resistance due to dust loading affects airflows.
TFP modules are terminal
HEPA filter plenums fitted with Microseal™ filters, and are designed for
ceiling installation in new cleanroom construction, or for upgrading existing
rooms. These modules are suitable for use in ceilings of plasterboard or
laminated-panel construction, and can be supplied in fan-assisted configuration.
Holding frames that provide effective clamping and sealing of filters are
available for ducted applications.
Quality Assurance and
Control
HEPA filter and laminar flow
products are manufactured in Australia under an accredited Total Quality
Management system.
On-site testing
Microseal™ filters are factory-tested
and certified by an ISO-registered laboratory. Additional testing and
certification should be carried out on site prior to use by a NATA Certified
technition, and subsequently as follows:
- After filter replacement
- At least annually
- In special circumstances, e.g.
if filter leakage is suspected
Laminar Air Flow Services,
is a registered Tradename and a division of AES Environmental (SA) PtyLtd
and provides comprehensive on-site maintenance, testing and certification
services for HEPA filter installations, cleanrooms, safety cabinets,
laminar flow work stations and fume cabinets. This service is available
from fully-equipped, NATA-registered laboratories in major Australian
centres. Similar services are provided by Clyde-Apac in Thailand, and
by appointed service agents in other regions.
Due to ongoing research &
development, Clyde-Apac reserves the right to modify the product &
specifications without notice.
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