126186 INSTALLATION MANUAL 392 10

Table Of Contents
ADJUSTING AIR FLOW
SETTING THE DAMPER
Basic flow
Fig. 11
Basic ventilation is set by moving the slid-
ing damper A to the desired position ac-
cording to marking B, Fig. 11. (See
diagram, page 32.)
Forced flow
Fig. 12
Open the damper and pull out the reducing
washer C, Fig. 12.
Fig. 13
Adjust forced ventilation by cutting out a
suitable number of rings from the reducing
washer, Fig. 13. (See diagram, page 31.)
Make sure that the guide groove D is cor-
rectly positioned when refitting the washer.
Measuring pressure drop
Fig. 14
The pressure drop is measured by fitting
the hose on the measuring port E at the
front edge of the coupling, Fig. 14.
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