Division:
25 I 77
Connection to the building's ventilation system via draught diverter
Connecting the ST1 weighing enclosure directly to the building's ventilation
system could possibly lead to destabilisation of the scale and contamination
due to fluctuating exhaust air flows. Any back pressure that may occur, for
example due to closing fire dampers in the building's ventilation system, could
lead to significant contamination.
With an optionally available draught diverter, the system can be connected to the building's
ventilation system. To avoid back pressure from the building's ventilation system, a draught
diverter must be used (installation between HEPA filter and building's ventilation system).
The building's ventilation system must have a sufficient exhaust air volume. The air volume
of the building's ventilation system should be 5-10% larger than the exhaust air volume of
the filter unit. Constant air volume (CAV) for all sizes: in chapter Technical Data.
The data in the table corresponds to an
assumed inflow velocity of 0.4 m/sec
(standard setting).
The air flowing into the filter unit (1) from
the enclosure is discharged into the
environment through the air vent. Here,
a transfer to the building's internal
ventilation system can be installed by
means of a draught diverter (3) mounted
on the exhaust air hose (2), if required.
Warning of contamination risks
Filtration unit with connected draught diverter
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