This variable-flow vent has a maneuvering system with 2 cords that allows the user to modify the extraction flow within a given range. Unless otherwise indicated, this vent is calibrated for a flow rate of 45 m³/h under 100 Pascals, maximum flow rate 105 m³/h.
VMRC: the adjustment is made using spacers (1) which are placed at the front stop (for the minimum flow) and at the rear stop (for the maximum flow) on the pivot point of the central shut-off.
This operation is carried out by removing the wire guide (2) from the axis of the shut-off.
VMF: the adjustment of the extraction flow is carried out by moving the central shut-off by varying degrees in the suction cone. The index (1) of the central shut-off will be placed opposite the annular mark located inside the suction cone. It will be advisable to check that the helical before locking the conical screw (2).
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