Datasheet

17
X-2023, www.findernet.com
G
7F
SERIES
7F SERIES
Filter Fans (24…700)m
3
/h
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 EN779 are specified 9 filter classes, categorised into 4 coarse dust
filters und 5 fine dust filters.
The coarse dust filters G1-G4 are able to filter particles >10μm and the
fine dust filters G5-G9 are able to filter particles from (1…10)μm.
Filter classes Example of particle Particle size
G1-G4
(EU1-EU4)
Textile fibers, hair, sand,
pollen, spores, insects,
cement dust
>10μm
G5-G9
(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
EN779 and branded after passing the test.
The filter mats are to filter class G3 or G4 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.
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.21 or 7F.31).
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 compensation device at the
upper sides of the cabinet or enclosure.
Please see general technical information