7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Application notes
Filter Fan
The ball-bearing axial fan housing is made of aluminium
and the rotor is made of plastic or metal (depending on the type).
Filter classes
Within DIN 24185 are specified 9 filter classes, categorised into 4
coarse dust filters und 5 fine dust filters.
The coarse dust filters (EU1 – EU4) are able to filter particles > 10 m
and the fine dust filters (EU5 – EU9) are able to filter particles from
(1…10) m.
Filtering degree (Am)
The degree of filtering (Am) is the percentages of dust, by weight,
that is caught and retained by the filter.
Filter mats
The quality of these filters mats has been independently tested,
according DIN 24185 and branded after passing the test.
The filter mats are to filter class EU3 and have an average filtering
degree of (80...90) %.
Filter material
The filter material consists of a synthetic fiber with progressive
construction which is moisture-resistant to 100 % RH and
temperature resistant to +100°C.
According to the strict requirements of fire class F1, DIN 53438, these
filter mats are self extinguishing.
Progressive construction at filter mats
The individual fibers of these filter mats are bonded by a special
process to provide a progressive construction where the fiber size and
spacing varies through the thickness of the filter mat.
This means that coarse dust particles are caught early and fine dust
later through the thickness of the mat. In this way the entire depth of
the filter mat is used.
Flammability class of the housing and the cover
The plastic materials used comply with flammability class V-0,
according UL94.
EMC Filter Fans and EMC Exhaust Filters
The plastic mounting frame of the EMC Filter Fans (7F.70) and
EMC Exhaust Filters (7F.07) are sprayed with a conductive (metallic)
paint.
The gasket located on the mounting frame, for sealing the Filter Fan or
Exhaust Filter in the cabinet is also metalised.
In addition; located at the EMC Filter Fan between the metalized
mounting frame and the filter mat, is a metal grid.
Therefore, between the metal parts of the Filter Fan and the metal
cabinet, there is a conductive connection.
Filter Fan in “reverse flow” version
As supplied, the standard Filter Fan is in “Draw-In”- mode, which
means that cool air is filtered and drawn into the cabinet. In some
cases it may be required that the warm air is blown out of the cabinet.
In which case it is possible to get Filter Fans in “Exhaust Filter” mode
version (7F.80).
Mounting of the pressure compensation device
In sealed cabinets and enclosures the internal pressure can vary due
to changes in temperature. The pressure compensation device (07F.80)
will relieve this internal/external pressure differential whilst maintaining
a high level of protection - preventing the ingress of dust and moisture
into the cabinet or the enclosure. The pressure compensation device
is approved for use in cabinets and enclosures according to
DIN EN 62208.
Drill a hole Ø 37+1.0 mm in the housing wall and fix the pressure
compensation device with the accompanying nut. It is important to
ensure that the sealing ring is located on the outside. To ensure
optimum pressure balance, it is recommended to fit 2 pressure
compansation device at the upper sides of the cabinet or enclosure.
Filter classes Example of particle Particle size
Textile fibers, hair, sand,
EU1 – EU4 pollen, spores, insects, > 10 µm
cement dust
Pollen, spores, cement dust,
EU5 – EU9 tobacco smoke, oil smoke, (1…10) µm
soot
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VII-2013, www.findernet.com
7F
SERIES