Trane QFNA-IOM-1 - Manual (Page 10)

Provide a Foundation
Most units will be mounted to or
hung from a concrete structure. If
mounted to a steel structure, the
mounting structure should be
welded. Table 2 refers to unit
weights.
Isolate the Fan
Isolation should be used to
prevent noise and vibration from
being transmitted to the building.
Arrangement 9: For units size
16-44, Class I and II
Mount directly to four flexible
isolators for either floor or ceiling
mounting. Use rails for wall
mounting. For vertically-mounted
fans, provide mounting legs to
which isolators are mounted.
Arrangement 9: For units size
49-60, Class I and II
Mount directly to eight isolators
when used with a steel or
concrete base. Eight bolts are
used to mount the fan to the base
in holes pre-drilled. These sizes
must be mounted horizontally.
When ceiling suspension is
required, the fan must be set on
an integral base which is hung
from the ceiling.
Arrangement 1: For units size
27-44, Class I and II
Use an integral steel or concrete
base rather than individual
isolators. Mount the fan
horizontally as shown in Figure 2.
Arrangements 1 and 9: For
units size 16-44, Class Ill
Provide a rigid integral steel base
or, preferably, an inertia pad.
Mount these fans horizontally.
Note: For some applications
involving large fans and high
pressures, thrust restraints may
be required. When used, mount
them on the fans exterior frame
members at the horizontal
centerline.
Clearances
Allow sufficient clearance around
the equipment to provide ample
room for servicing and
maintenance. Inlet screen may be
used if the fan has an unducted
inlet. Recommended minimum
clearance is no less than 1/2 the
fan wheel diameter away from a
wall or obstruction.
Installation —Q Fan
10 QFNA-IOM-1