Wöhler DH 420, Operating Manual

Page: 31 / 85

Design and function
31
EN
3.1 Function
Fig. 22: Application example: Cleaning
ventilation ducts
With the Wöhler DG 420 Pneumatic Viper it is
possible to clean both rectangular and round ven-
tilation ducts with large or small tube cross-
sections.
You can hold the lightweight viper by the handle
as you work or attach the clip to your belt so both
of your hands are free to work with.
Thanks to its FRP reinforcement the 10 m long
hose can easily be pushed into the ductwork.
The position of the end of the hose in the duct can
be read off from the large display (digital meter
counter).
Fig. 23: Hose reel - compressed air
With a 20 m hose the Wöhler hose reel is con-
nected between the compressor and the com-
pressed air viper to enable the user to move
around freely while working without having to
move the compressor.
Fig. 24: Helicopter nozzle and com-
pressed air whip
It is possible to insert a compressed air whip or
helicopter nozzle (forwards or backwards) onto
the end of the hose to perform the cleaning task
effectively.
Fig. 25: Roller guide ball
The roller guide ball is deployed in wide, rectangu-
lar shafts, see accessories.