Aero acoustic diffuser™ installation – Twin City Aero Acoustic Diffuser - ES-409 User Manual
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Twin.City.Engineering.Supplement.409
Aero Acoustic Diffuser™ Installation
Follow.the.proper.handling.instructions.given.earlier..If.
mounting.slots.are.not.supplied,.proceed.to.Step.1;.if.
mounting.slots.are.supplied.on.fan,.proceed.to.Step.3:
1..Using. the. formulas. below,. calculate. mounting. hole.
locations..(See.Figure.1):
. “A”.=. Measured.in.the.field..(Distance.from.inside..
.
. frame.to.impeller.backplate)
. “B”.=. Measured.in.the.field..(Distance.from.impeller...
.
. backplate.to.impeller.frontplate)
. “C”.=. “A”–1.40
. “D”.=. “A”+“B”+“F”.
. “E”. =. See.Table.1
. “F”. =. See.Table.1
2..Measure,. mark. and. drill. mounting. bracket. holes. as.
shown. (See. Figure. 1).. Note:. Holes. are. required. on.
both.sides.of.fan.on.the.top.and.bottom.frame.rails.
for. sixteen. (16). holes.. Lifting. lugs. may. need. to. be.
removed.
3..If.not.done.so,.separate.backplate.diffuser.and.front-
plate.diffuser.into.two.(2).halves.by.removing.connec-
tor. brackets. provided.. Four. (4). diffuser. pieces. will.
result..(See.Figure.2)
4..Insert. each. diffuser. section. into. the. fan. frame.. As.
shown.in.Figure.3..The.backplate.diffuser.mounts.on.
backplate. side. of. impeller;. the. frontplate. diffuser.
mounts. on. the. frontplate. side. of. impeller.. Note:
Perforated side of diffuser sections must be in the air
path (see Figure 3).
5..With.the.four.(4).diffuser.sections.located.inside.the.
fan.framework,.use.the.screws.and.connector.brack-
ets. removed. in. Step. 3. to. reassemble. the. two. (2).
diffuser.halves.back.together.as.shown.in.Figure.4.
Table 1.
Size
E
F
122
0.89
0.03
150
0.89
0.00
165
0.89
0.00
182
0.93
0.16
200
0.93
0.13
222
1.13
0.13
245
1.13
0.19
270
1.13
0.16
300
1.13
0.16
330
1.13
0.16
Size
E
F
365
1.19
0.15
402
1.19
0.16
445
1.19
0.15
490
1.19
0.15
542
1.19
0.12
600
1.19
0.46
660
1.19
0.58
730
1.19
0.41
807
1.19
0.31
(16) 0.56 SLOTS
(8) ONE EACH SIDE
C
1.25
TYP.
D
E
A
B
Figure 1.
Figure 2.
PERF PLATE TO BE FLUSH
WITH END OF BACKPLATE
ON WHEEL
FRONTPLATE
DIFFUSER,
LOCATE AS
CLOSE TO
FRONTPLATE
TIP AS
POSSIBLE
BACKPLATE
DIFFUSER
Figure 3.
Figure 4.
Figure 5.