Datasheet

12
X-2013, www.findernet.com
G
7F SERIES
Filter Fan (24…630)m
3
/h
7F
SERIES
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μm and
the fine dust filters (EU5-EU9) are able to filter particles from (1…10)μm.
Filter classes Example of particle Particle size
EU1-EU4
Textile fibers, hair, sand,
pollen, spores, insects,
cement dust
>10μm
EU5-EU9
Pollen, spores, cement dust,
tobacco smoke, oil smoke,
soot
(1…10)μm
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.