Trane Fan - Manual (Page 11)

11
Features
and Benefits
The Trane Model Q ™ fan, with all its
precision and quality, is still a cost
effective fan. When all necessary
system components are considered, it
provides substantial installation cost
savings. In addition, its small size and
variable mounting positions allow
more freedom to the designer and
installer.
First Cost Comparisons
True first cost is the total cost of an
operable installation. With the Trane
Model Q, this consists of only the fan,
drive and isolation. By comparison, the
airfoil centrifugal typically requires
these three components, plus an
integral base. In addition, cost of
isolation for the airfoil is greater
because it is typically twice as heavy as
the Model Q.
The common vaneaxial also requires
more components in most
applications. Besides the fan, drive and
isolation, an inlet bell and diffuser are
frequently necessary to meet cataloged
performance. A sound attenuator is
also required to reduce noise to a level
equivalent to a Model Q fan without
attenuation.
Reduce Installed Cost
By Up To 20 Percent
Lower Installation Costs
The Trane Model Q fan has fewer
components to install and the
advantage of lighter weight. With only
half the weight of airfoil and tubular
centrifugals, it requires less manpower
for rigging and setting the fan in place.
The result is reduced labor, with
corresponding dollar savings on the
typical job.
Lighter weight also reduces inertia pad
requirements. With the Model Q, a pad
has to be considered only on large
Table F-1 — Total Installed Cost Comparison
Standard Trane Tubular
Item Required Centrifugal Model Q Centrifugal Vaneaxial
First Cost Requirement
Fan X X X X
Belt Guard X X X
Integral Base X
Inlet Bell X
Attenuation X
Spring Isolators X X X X
Installation Cost Requirements
Rigging X X X X
Install Attenuation X
Mount Motor (Etc.) X X
Install Isolation X X X X
Average Total Installed Cost X –5 +5 +15
Comparison is based on equal size fans of similar capacities. The airfoil centrifugal fan is used as base (100%) for
comparative purposes. Figures are based on estimates by experienced installing contractors.
Arrangement 9 Trane Model Q fan
requires purchase of motor, motor
rails, belt guard and isolation in
addition to the basic fan. Arrangement 3 airfoil centrifugal fan
requires purchase of motor, belt
guard, motor slide rail, isolation and
subbase in addition to basic fan.
Class III fans. Airfoil and tubular
centrifugals, because of greater weight,
often require pads for Class I and II to
minimize the effect imposed by normal
vibration.
Combined Saving Significant
A comparison of average total installed
cost is shown in Table F-1. Average cost
figures were developed based on
estimates by experienced installing
contractors. In all cases, the Trane
Model Q represents a significant
savings.