The Quiet Pack in-line acoustic fans shall be as supplied from Roof
Units, designed around a high performance centrifugal impeller, offering
a highly efficient, quiet and compact in-line acoustic fan.
Composition
The Quiet Pack fan range is manufactured from prime quality galvanised
sheet steel, ensuring a robust in-line fan for those tough site
conditions.
Fan
The motor and backward curved impeller shall be factory matched,
statically and dynamically balanced on precision machines, to DIN ISO
1940 Grade 6.3, to give quiet, vibration free running.
Motor
Motor insulation Class B, suitable for operating temperatures from -15°C
to +40°C and atmospheres up to 95% RH. All sizes are ideally suitable
for speed control by electronic or voltage reduction. Vent-Axia would
recommend that a voltage reduction Auto Transformer speed controller is
used with all Quiet Pack units to ensure minimum noise levels during
speed control and to eliminate any possibility of harmonic noise levels
which may occur when using electronic speed controllers at lower
speeds.