DFO-103 - page 4

Chicago offersDesign 51RA fans espe-
cially suited for certain lower pressure
applications or installations. Chicago’s
RA fans provide a viable alternative.
Comparisons of the designs are shown
on page 28 of our D/51 Double Width
websitebulletin.
.
Chicago offers twomethods of selecting
the desired Design 51 fan. For those
whose primary consideration is energy
consumption, one method selects the
most energy efficient fan size for any
requiredduty.
When the initial concern ismaximumfan
outlet velocity, an alternate method
provides thesmallest possible fansize to
meet any specified outlet velocity limit.
Tablesandexamplesareonpages6and
7of ourDesign51DoubleWidthwebsite
bulletin.
Design51RA
ForLowPressure
Applications
QuickSelection
Methods
Performanceand
ConvenienceOptions
Inlet
VolumeControl
For economical performance at
partial loadsandpreciseair con-
trol for systems needing to
maintain a positive or nega-
tivepressureatminimal flow,
theInletVolumeControl (IVC)
is recommended. Adjustable
guidevanespre-spin theen-
tering air to produce the de-
sired volume of air while
maintaining the full amount
of block off pressure. Inlet
vanes are mounted entirely
within the inlet cone. The
IVC is suitable for automatic
ormanual operation.
4
1,2,3 5,6,7,8,9,10,11,12,13,14,...52
Powered by FlippingBook