7F
SERIES
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Features
7F.50.8.xxx.1020
7F.50.8.xxx.2055
7F.50.8.xxx.3100
Filter Fan for electrical cabinets and enclosures
120 V or 230 V AC versions
Very low acoustic noise
Minimal depth within enclosure
• Air volume (14…370) m³/h/(8.2...217.8) CFM
(with Exhaust Filter installed in cabinet)
• Air volume (24...500) m³/h (free flow)
(14.1...294.3) CFM (free flow)
• Power consumption (4...70) W
• Operating voltage: 120 or 230 V AC (50/60Hz)
• Time-saving installation and maintenance
• Further available versions*:
- EMC Filter Fan (7F.70) and
EMC Exhaust Filter (7F.07)
- Filter Fan supplied in Reverse flow mode
(7F.80)
•
•
Operating voltage
120, 230 V AC
• Air volume 24 m³/h (14.1 CFM)
• Rated power 13 W
• Size 1
•
Operating voltage
120, 230 V AC
• Air volume 55 m³/h (32.4 CFM)
• Rated power 22 W
• Size 2
•
Operating voltage
120, 230 V AC
• Air volume 100 m³/h (58.9 CFM)
• Rated power 22 W
• Size 3
•
* Product codes, see pages 5 & 8
Note:
By reversing the fan motor, the air direction
can be changed from “Draw-In” Filter Fan mode
to “Exhaust” Filter Fan mode ** (except for the
types 7F.50.8.xxx.4370 and 7F.50.8.xxx.5500).
** Supplied in “Draw-In” Filter Fan mode (Standard).
Fan data
Air volume (free flow)
m³/h (CFM)
21
55
102
24 (14.1)
55 (32.4)
100 (58.9)
14 (8.2)
40 (23.5)
75 (44.1)
30
43
43
50 000
50 000
50 000
Air volume (with exhaust filter installed) m³/h (CFM)
Noise level
dB (A)
Life time at 40°C
h
Electrical data
Operating voltage
V AC (50/60 Hz)
120
230
120
230
120
230
A
0.14
0.1
0.26
0.14
0.26
0.14
W
13
13
22
22
22
22
Current consumption
Rated power
Other data
Housing, cover
Plastics according to UL94 V-0, light gray (RAL 7035)
Filter mat (included)
EU3 according to DIN 24185, filtering degree (80...90) %
Filter material
Synthetic fibre with progressive construction, temperature resistant to +100°C,
VII-2013, www.findernet.com
self extinguishing, Class F1 (DIN 53438)
Electrical connections / wire size
Screw torque
3-pole screw terminals / max. 2.5 mm²
Nm
0.8
°C
−10…+70
Ambient temperature range
Protection class
Protection category according to EN 60529
I
IP54
Approvals (according to type)
1
7F
SERIES
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Features
7F.50.8.xxx.4230
7F.50.8.xxx.4370
7F.50.8.xxx.5500
Filter Fan for electrical cabinets and enclosures
120 V or 230 V AC versions
Very low acoustic noise
Minimal depth within enclosure
• Air volume (14…370) m³/h/(8.2...217.8) CFM
(with Exhaust Filter installed in cabinet)
• Air volume (24...500) m³/h (free flow)
(14.1...294.3) CFM (free flow)
• Power consumption (4...70) W
• Operating voltage: 120 or 230 V AC (50/60Hz)
• Time-saving installation and maintenance
• Further available versions*:
- EMC Filter Fan (7F.70) and
EMC Exhaust Filter (7F.07)
- Filter Fan supplied in Reverse flow mode
(7F.80)
•
•
Operating voltage
120, 230 V AC
• Air volume 230 m³/h (135.4 CFM)
• Rated power 40 W
• Size 4
•
Operating voltage
120, 230 V AC
• Air volume 370 m³/h (217.8 CFM)
• Rated power 70 W
• Size 4
•
Operating voltage
120, 230 V AC
• Air volume 500 m³/h (294.3 CFM)
• Rated power 70 W
• Size 5
•
* Product codes, see pages 5 & 8
Note:
By reversing the fan motor, the air direction
can be changed from “Draw-In” Filter Fan mode
to “Exhaust” Filter Fan mode ** (except for the
types 7F.50.8.xxx.4370 and 7F.50.8.xxx.5500).
** Supplied in “Draw-In” Filter Fan mode (Standard).
Fan data
200
300
550
m³/h (CFM)
230 (135.4)
370 (217.8)
500 (294.3)
Air volume (with exhaust filter installed) m³/h (CFM)
180 (105.9)
250 (147.1)
370 (217.8)
53
65
65
50 000
50 000
50 000
Air volume (free flow)
Noise level
dB (A)
Life time at 40°C
h
Electrical data
Operating voltage
V AC (50/60 Hz)
120
230
120
230
120
230
A
0.34
0.17
0.8
0.4
0.8
0.4
40
40
70
70
70
70
Current consumption
Rated power
W
Other data
5
Housing, cover
Plastics according to UL94 V-0, light gray (RAL 7035)
Filter mat (included)
EU3 according to DIN 24185, filtering degree (80...90) %
Filter material
Synthetic fibre with progressive construction, temperature resistant to +100°C,
Electrical connections / wire size
Screw torque
3-pole screw terminals / max. 2.5 mm²
Nm
0.8
°C
−10…+70
Ambient temperature range
Protection class
Protection category according to EN 60529
Approvals (according to type)
2
I
IP54
VII-2013, www.findernet.com
self extinguishing, Class F1 (DIN 53438)
7F
SERIES
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Features
7F.50.9.024.1020
7F.50.9.024.2055
Filter Fan for electrical cabinets and enclosures
24 V DC versions
Very low acoustic noise
Minimal depth within enclosure
• Air volume (14…180) m³/h/(8.2...105.9) CFM
(with Exhaust Filter installed in cabinet)
• Air volume (24...230) m³/h (free low)
(14.1...135.4) CFM (free flow)
• Power consumption (4...26) W
• Operating voltage: 24 V DC
• Time-saving installation and maintenance
• Further available versions*:
- EMC Filter Fan (7F.70) and
EMC Exhaust Filter (7F.07)
- Filter Fan supplied in Reverse flow mode
(7F.80)
•
•
Operating voltage 24 V DC
Air volume 24 m³/h (14.1 CFM)
• Rated power 4 W
• Size 1
Operating voltage 24 V DC
Air volume 55 m³/h (32.4 CFM)
• Rated power 9 W
• Size 2
•
•
•
•
* Product codes, see pages 5 & 8
Note:
By reversing the fan motor, the air direction
can be changed from “Draw-In” Filter Fan mode
to “Exhaust” Filter Fan mode ** (except for the
types 7F.50.8.xxx.4370 and 7F.50.8.xxx.5500).
** Supplied in “Draw-In” Filter Fan mode (Standard).
Fan data
Air volume (free flow)
m³/h (CFM)
Air volume (with exhaust filter installed) m³/h (CFM)
Noise level
dB (A)
Life time at 40°C
h
24 (14.1)
55 (32.4)
14 (8.2)
40 (23.5)
35
45
50 000
50 000
Electrical data
Operating voltage
V DC
Current consumption
Rated power
24
24
A
0.16
0.37
W
4
9
Other data
Housing, cover
Plastics according to UL94 V-0, light gray (RAL 7035)
Filter mat (included)
EU3 according to DIN 24185, filtering degree (80...90) %
Filter material
Synthetic fibre with progressive construction, temperature
VII-2013, www.findernet.com
resistant to 100°C, self extinguishing, Class F1 (DIN 53438)
Electrical connections / wire size
Screw torque
3-pole screw terminals / max. 2.5 mm²
Nm
0.8
°C
−10…+70
Ambient temperature range
Protection class
Protection category according to EN 60529
I
IP54
Approvals (according to type)
3
7F
SERIES
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Features
7F.50.9.024.3100
7F.50.9.024.4230
Filter Fan for electrical cabinets and enclosures
24 V DC versions
Very low acoustic noise
Minimal depth within enclosure
• Air volume (14…180) m³/h/(8.2...105.9) CFM
(with Exhaust Filter installed in cabinet)
• Air volume (24...230) m³/h (free flow)
(14.1...135.4) CFM (free flow)
• Power consumption (4...26) W
• Operating voltage: 24 V DC
• Time-saving installation and maintenance
• Further available versions*:
- EMC Filter Fan (7F.70) and
EMC Exhaust Filter (7F.07)
- Filter Fan supplied in Reverse flow mode
(7F.80)
•
•
Operating voltage 24 V DC
Air volume 100 m³/h (58.9 CFM)
• Rated power 9 W
• Size 3
Operating voltage 24 V DC
Air volume 230 m³/h (135.4 CFM)
• Rated power 26 W
• Size 4
•
•
•
•
* Product codes, see pages 5 & 8
Note:
By reversing the fan motor, the air direction
can be changed from “Draw-In” Filter Fan mode
to “Exhaust” Filter Fan mode ** (except for the
types 7F.50.8.xxx.4370 and 7F.50.8.xxx.5500).
** Supplied in “Draw-In” Filter Fan mode (Standard).
Fan data
Air volume (free flow)
m³/h (CFM)
Air volume (with exhaust filter installed) m³/h (CFM)
Noise level
dB (A)
Life time at 40°C
h
100 (58.9)
230 (135.4)
75 (44.1)
180 (105.9)
45
61
50 000
50 000
Electrical data
Operating voltage
V DC
Current consumption
A
Rated power
W
Other data
24
24
0.37
1.08
9
26
Kunststoff nach UL94 V-0, lichtgrau (RAL 7035)
Housing, cover
Plastics according to UL94 V-0, light gray (RAL 7035)
Filter mat (included)
EU3 according to DIN 24185, filtering degree(80...90) %
Filter material
Synthetic fibre with progressive construction, temperature
Electrical connections / wire size
Screw torque
3-pole screw terminals / max. 2.5 mm²
Nm
0.8
°C
−10…+70
Ambient temperature range
Protection class
Protection category according to EN 60529
Approvals (according to type)
4
I
IP54
VII-2013, www.findernet.com
resistant to 100°C, self extinguishing, Class F1 (DIN 53438)
7F
SERIES
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Ordering information
Example: Series 7F, Filter Fan for mounting in sidewalls, operating voltage 230 V AC, size 1, air volume 24 m³/h.
7
F . 5
0 . 8 . 2 3 0 . 1
0
2
0
Series
Type
50 = Filter Fan - for indoor use
70 = EMC Filter Fan - for indoor use
80 = Reverse flow Filter Fan - for indoor use
Supply version
8 = AC (50/60 Hz)
9 = DC
Operating voltage
024 = 24 V DC
120 = 120 V AC
230 = 230 V AC
Enclosure cut-out
1 = Size 1 (92+0.5 x 92+0.5) mm
2 = Size 2 (125+1.0 x 125+1.0) mm
3 = Size 3 (177+1.0 x 177+1.0) mm
4 = Size 4 (224+1.0 x 224+1.0) mm
5 = Size 5 (291+1.0 x 291+1.0) mm
Air volume (free flow)
020 = 24 m³/h (14.1 CFM)
055 = 55 m³/h (32.4 CFM)
100 = 100 m³/h (58.9 CFM)
230 = 230 m³/h (135.4 CFM)
370 = 370 m³/h (217.8 CFM)
500 = 500 m³/h (294.3 CFM)
Filter Fans - All versions
Standard versions
EMC versions
Reverse flow versions
7F.50.8.120.1020
—
7F.80.8.120.1020
Filter Fan, Size 1
7F.50.8.120.2055
—
7F.80.8.120.2055
Filter Fan, Size 2
7F.50.8.120.3100
—
7F.80.8.120.3100
Filter Fan, Size 3
7F.50.8.120.4230
—
7F.80.8.120.4230
Filter Fan, Size 4
7F.50.8.120.4370
—
7F.80.8.120.4370
Filter Fan, Size 4
7F.50.8.120.5500
—
7F.80.8.120.5500
Filter Fan, Size 5
7F.50.8.230.1020
7F.70.8.230.1020
7F.80.8.230.1020
Filter Fan, Size 1
7F.50.8.230.2055
7F.70.8.230.2055
7F.80.8.230.2055
Filter Fan, Size 2
7F.50.8.230.3100
7F.70.8.230.3100
7F.80.8.230.3100
Filter Fan, Size 3
7F.50.8.230.4230
7F.70.8.230.4230
7F.80.8.230.4230
Filter Fan, Size 4
7F.50.8.230.4370
7F.70.8.230.4370
7F.80.8.230.4370
Filter Fan, Size 4
7F.50.8.230.5500
7F.70.8.230.5500
7F.80.8.230.5500
Filter Fan, Size 5
7F.50.9.024.1020
7F.70.9.024.1020
7F.80.9.024.1020
Filter Fan, Size 1
7F.50.9.024.2055
7F.70.9.024.2055
7F.80.9.024.2055
Filter Fan, Size 2
7F.50.9.024.3100
7F.70.9.024.3100
7F.80.9.024.3100
Filter Fan, Size 3
7F.50.9.024.4230
7F.70.9.024.4230
7F.80.9.024.4230
Filter Fan, Size 4
VII-2013, www.findernet.com
Note:
The technical features (air volume, dimensions and electrical parameters) for the Standard Filter Fans (7F.50), the EMC Filter Fans (7F.70)
and the Reverse flow versions (7F.80) - are exactly the same.
5
7F
SERIES
7F Series - Exhaust Filter
Features
7F.05.0.000.1000
7F.05.0.000.2000
7F.05.0.000.3000
Exhaust Filter
The size of the Exhaust Filter should match
the size of the Filter Fan to achieve the
best ventilation within the cabinet
Minimum depth within enclosure
Time-saving installation and maintenance
• Further available versions*:
- EMC Exhaust Filters (7F.07)
•
•
* Product codes, see page 8
For Filter Fans
7F.50.x.xxx.1020
• Size 1
•
For Filter Fans
7F.50.x.xxx.2055
• Size 2
•
For Filter Fans
7F.50.x.xxx.3100
• Size 3
•
Other data
Housing, Cover
Filter mat (included)
Filter material
Plastics according to UL94 V-0, light gray (RAL 7035)
EU3 according to DIN 24185, filtering degree (80...90) %
Synthetic fibre with progressive construction, temperature resistant to +100°C,
self extingiushing, Class F1 (DIN 53438)
Protection category according to EN 60529
IP54
VII-2013, www.findernet.com
Approvals (according to type)
6
7F
SERIES
7F Series - Exhaust Filter
Features
7F.05.0.000.4000
7F.05.0.000.5000
Exhaust Filter
The size of the Exhaust Filter should match
the size of the Filter Fan to achieve the
best ventilation within the cabinet
Minimum depth within enclosure
Time-saving installation and maintenance
• Further available versions*:
- EMC Exhaust Filters (7F.07)
•
•
* Product codes, see page 8
For Filter Fans
7F.50.x.xxx.4230 or
7F.50.8.xxx.4370
• Size 4
•
For Filter Fans
7F.50.8.xxx.5500
• Size 5
•
Other data
Housing, Cover
Filter mat (included)
Filter material
Plastics according to UL94 V-0, light gray (RAL 7035)
EU3 according to DIN 24185, filtering degree (80...90) %
Synthetic fibre with progressive construction, temperature
resistant to +100°C, self extingiushing, Class F1 (DIN 53438)
Protection category according to EN 60529
IP54
VII-2013, www.findernet.com
Approvals (according to type)
7
7F
SERIES
7F Series - Exhaust Filter
Ordering information
Example: Series 7F, Exhaust Filter for mounting in sidewalls, size 1.
7
F . 0
5 . 0 . 0 0 0 . 1
0
0
0
Series
Type
05 = Exhaust Filter - for indoor use
07 = EMC Exhaust Filter - for indoor use
Supply version
0 = Not applicable for Exhaust Filter
Operating voltage
000 = Not applicable for Exhaust Filter
Enclosure cut-out
1000 = Size 1 (92+0.5 x 92+0.5) mm
2000 = Size 2 (125+1.0 x 125+1.0) mm
3000 = Size 3 (177+1.0 x 177+1.0) mm
4000 = Size 4 (224+1.0 x 224+1.0) mm
5000 = Size 5 (291+1.0 x 291+1.0) mm
Components
Exhaust Filter - All versions
Standard-versions
EMC - versions
7F.05.0.000.1000
7F.07.0.000.1000
Exhaust Filter, Size 1
7F.05.0.000.2000
7F.07.0.000.2000
Exhaust Filter, Size 2
7F.05.0.000.3000
7F.07.0.000.3000
Exhaust Filter, Size 3
7F.05.0.000.4000
7F.07.0.000.4000
Exhaust Filter, Size 4
7F.05.0.000.5000
7F.07.0.000.5000
Exhaust Filter, Size 5
Standard-Filter Fan
Standard-Exhaust Filter EMC-Filter Fan
EMC-Exhaust Filter
Filter mat
7F.50.8.xxx.1020
7F.05.0.000.1000
7F.70.8.xxx.1020
7F.07.0.000.1000
07F.15
1
7F.50.8.xxx.2055
7F.05.0.000.2000
7F.70.8.xxx.2055
7F.07.0.000.2000
07F.25
2
7F.50.8.xxx.3100
7F.05.0.000.3000
7F.70.8.xxx.3100
7F.07.0.000.3000
07F.35
3
7F.50.8.xxx.4230
7F.05.0.000.4000
7F.70.8.xxx.4230
7F.07.0.000.4000
07F.45
4
7F.50.8.xxx.4370
7F.05.0.000.4000
7F.70.8.xxx.4370
7F.07.0.000.4000
07F.45
4
7F.50.8.xxx.5500
7F.05.0.000.5000
7F.70.8.xxx.5500
7F.07.0.000.5000
07F.55
5
7F.50.9.024.1020
7F.05.0.000.1000
7F.70.9.024.1020
7F.07.0.000.1000
07F.15
1
7F.50.9.024.2055
7F.05.0.000.2000
7F.70.9.024.2055
7F.70.0.000.2000
07F.25
2
7F.50.9.024.3100
7F.05.0.000.3000
7F.70.9.024.3100
7F.70.0.000.3000
07F.35
3
7F.50.9.024.4230
7F.05.0.000.4000
7F.70 9 024 4230
7F.70.0.000.4000
07F.45
4
07F.25
07F.45
07F.55
Spare Filter mats
07F.15
Protection category
Accessories
Size
IP54
Pressure compensation device, for pressure compensation
in closed cabinets or enclosures
Air interface area
cm²
Mounting
Torque
Nm
7
5 (max. 10)
plastic according to UL94-V0
mm
Mounting position
Ambient temperature
07F.80
PG 29 thread with union nut
Material
Dimensions (diameter / depth)
07F.35
65.5 / 30.5
upper part of cabinet sidewalls
°C
Protection category
−45…+70
IP55
Unit package contains 2 pressure compensation devices
8
VII-2013, www.findernet.com
07F.80
7F
SERIES
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Mounting instructions for Filter Fans and Exhaust Filters
Mounting arrangement of Filter Fans and Exhaust Filters
Filter
Fan
Drilling template and mounting cut-outs for Filter Fans and Exhaust Filter
Size 1
Size 2
Size 3
Size 4
Size 5
VII-2013, www.findernet.com
Mounting and maintenance
1. Make the panel cut-out according to the size of the Filter Fan or Exhaust Filter in the sidewall of the cabinet as appropriate.
A template of the panel cut-out is included in the packaging of the Filter Fan or Exhaust Filter.
2. Make the electrical connection.
3. Mount by simply snapping the side-located lugs on the Filter Fan or Exhaust Filter into the panel cut-out (without using screws for sidewall
thickness of 1,2...2,4 mm).
At other thickness it is recommended to mount the Filter Fan by the screws supplied (for size 1, the template shows the mounting cut-out only).
4. When screws are needed for the mounting, remove the plastic cover and fix the Filter Fan with the 4 screws supplied.
Then insert the filter mat and snap the plastic cover to the mounting frame.
5. During maintenance or when replacing the filter mat remove the plastic cover, replace the filter mat and snap on the plastic cover.
9
SERIE
7F
7F Series - Filter Fan (24…500) m³/h (14.1...294.3) CFM
Fan selection
Power dissipation (W)
Temperature difference (° C) between the inside and
the outside of the cabinet
Air Flow (m3/h)
24 m3/h
55 m3/h
100 m3/h
230 m3/h
370 m3/h
500 m3/h
VII-2013, www.findernet.com
Example:
First, estimate the power dissipated within the cabinet. Then calculate the maximum difference between the internal and external temperature (green
lines) by considering the difference between the maximum permitted internal temperature (as dictated by the temperature rating of the enclosed
components, or specification) and the maximum temperature expected outside the cabinet.
The projection onto the X axis, of the intersection between the power (watts) and the appropriate green line, corresponds to the air flow rate in m3/h
required to meet the maximum internal temperature limit. Extending this line vertically to intersect with the blue horizontal lines, indicates the most
appropriate model of 7F fan to be fitted to the cabinet to provide the requisite air flow.
The example above considers a cabinet with an internal thermal power dissipation of 500 W, and assumes the maximum temperature difference
between the inside and the outside of the cabinet to be 20 ° C. The required air flow can be seen to be a little less than 80 m3/h.
It is suggested that this is increased by 10% to allow for the affects of a dirty filter.
And so, it can be seen that models of the 7F with100 m3 / h flow rate will provide the proper dissipation of heat under these circumstances.
10
7F
SERIES
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 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
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.
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.
VII-2013, www.findernet.com
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).
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