C 25
10
30 - 45°
DUCT DIMENSIONING AND SYSTEM INSTALLATION
Cleaning access point
Cleaning access point
NB! To adjust the air flow, a re
-
gulating damper in the clean air
duct can be used.
Nederman Original
Fume Extractors with
automatic dampers
After cleaning
damper
The inlet on the
opposite side is
used as a cleaning
and inspection
access point.
Recommendations
• To avoid pressure losses and dust deposits in the sys
-
tem it is important to use the correct duct diameter. The
transport velocity shall be at least 10 - 12 m/s
for fume and 15 - 20 m/s for dust. Take velocity in
to account when choosing the duct diameters. The velo-
city should never decrease en route to FilterMax
C 25. The following duct diameters can be used for
the connection to FilterMax C 25: Ø 250 mm for the inlet
and Ø 315 mm for the outlet.
• Use long radius bends and no t-pieces.
• Install plenty of cleaning access points in the
ducting system before FilterMax C 25.
• If the dust is abrasive it may be necessary to
use thick walled (or rubber coted) material in bends
and other exposed areas.
• To avoid pressure losses the ducting system
should be as short as possible and designed with
two or more branches.
• Use larger diameters on the clean side to
reduce pressure losses.
• Use fire dampers when the duct system is
passing from one fire zone to another.
NB! Fire
dampers do not stop explosions!
•
Install a flow meter in the outlet duct (at least
3 m from the filter outlet).
• If there is a significant fire risk, it is better to install
several small systems then one large system.
• Install a sparktrap to prevent sparks or burning/
glowing material from entering the FilterMax C 25.
• At welding work on oiled material the filter cart
-
ridges should be treated with fine lime powder (ap
-
prox. 60 g) before the first start.
Cleaning
access point
WARNING!
Fire risk!
• Grinding, welding or other hot works on the filter
ex-
terior or inlet must not be done without cleaning and
stopping the operation.
• Connect a fire alarm to the filter controling processor,
which means the filter will stop at a possible fire.
• Care should be taken when working with painted
or oiled material. Consult your Nederman repre-senta-
tive for advice.
• FilterMax C 25 must not be exposed for burning/glo
-
wing material.
