ADJUSTING AIR FLOW
SETTING THE DAMPER
Basic flow
Fig. 4
Basic ventilation is set by moving the slid-
ing damper A to the desired position ac-
cording to marking B, Fig. 4. (See diagram,
page 28.)
Forced flow
Fig. 5
Open the damper and pull out the reducing
washer C, Fig. 5.
Fig. 6
Adjust forced ventilation by cutting out a
suitable number of rings from the reducing
washer, Fig. 6. (See diagram, page 27.)
Make sure that the guide groove D is cor-
rectly positioned when refitting the washer.
Measuring pressure drop
Fig. 7
The pressure drop is measured by fitting
the hose on the measuring port E at the
front edge of the coupling, Fig. 7.
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