Global Unitary Systems
QuietCurb™
What is QuietCurb™ ?
An innovative "Quiet Comfort" option
The QuietCurb is an acoustically-engineered roof curb product which
further enhances the Trane IntelliPak by reducing operating sound
power levels. In some sizes, the Trane rooftop, with the QuietCurb
accessory, is as much as 18 NC lower than the equivalent size
competitive model! Read on and COMPARE.
Page 1
Unitary Products Group
QuietCurb™
How Does it Work?
Addresses the Three Major Components of Rooftop Generated Sound
The curb prevents regenerated noise (vibratory noise resulting from the
transmission of sound from a turbulent fluid or mechanical source) through the
use of an integral spring-vibration isolation rail. Installer's Guide
High frequency components of rooftop noise are absorbed by the High density
insulation lining the interior of the curb.
Page 2
Global Unitary Systems
QuietCurb™
Low frequency noise is reduced / eliminated through the use of a unique
air flow path-plenum design which reduces air turbulence and permits the
low frequency noise to "break out" above the roof line before entering the
building.
What products can QuietCurb™
be applied to?
IntelliPak™ Packaged Rooftops
The entire line of 20 - 130 ton IntelliPak packaged rooftops and roofmounted air handling products which have the extended ("X-casing")
design, i.e. all SX (extended casing-cooling only), SF (cooling with gas
heat), SS (cooling with steam heat), SL (cooling with hot water heat), and
SE (cooling with electric heat) models. The curb is not available for SA
models (this is because the SA model rooftops should never be chosen
for applications where noise is a concern - they are typically up to 6 dB
louder than the equivalent extended-casing model)
Page 3
Global Unitary Systems
QuietCurb™
Features & Benefits
Up to 18 NC quieter than competitive offerings.
Easy and quick to install curb ships fully assembled.
Spring isolated curb with special air flow plenum design
addresses all major compnenets of rooftop generated noise.
Seismic option available to meet seismic criteria in most regions of
the U.S.
Applicable to IntelliPak packaged rooftops and air handlers and, C
& E-style units which are design sequence "P" and "H" or higher
respectively.
Quick production cycle curb cycle is 2 - 4 weeks.
Product Positioning
Sound Sensitive Applications - always apply QuietCurb.
Potentially Sound Sensitive Applications - QuietCurb
is strongly recommended with extended casing models (SE,SF, SL, SS &
SX) should be utilized.
Sound is Not a Concern - the lower cost SA model may be bid
Page 4
Global Unitary Systems
QuietCurb™
in lieu of an SX. Keep in mind that utilization of the SA usually results in
about 6 dB sound penalty - versus an SX.
Selling Strategy
Actual Test Results - confirm that QuietCurb is a real solution
producing real quiet comfort results.
Octave Band Sound Power Level Data - is provided to
document the acoustical performance of QuietCurb.
Factory Assembly - minimizes field labor time and expense and
assures the customer that he/she will get consistent, repeatable results
each time QuietCurb is applied.
Patent Pending Design - QuietCurb is a unique development in
quiet comfort technology which is easily differentiable from fieldfabricated/other competitive solutions.
Page 5
Global Unitary Systems
QuietCurb™
How Do I Order the QuietCurb
QuietCurb model numbers and pricing are available through the
LYNX™ Productivity Suite. The curbs are build-to-order and have a
2-4 week production cycle
WHEN ENTERING THE ORDER YOU MUST INCLUDE THE
PRODUCT CODE (394), QUANTITY, AND ASSOCIATED
SPECIFIC CURB MODEL NUMBER(S).
The QuietCurb model number nomenclature is shown on the
following page.
Stock or Build-to-order (BTO)?
Note:Curbs are build-to-order items only, just as the large rooftop
products are. However, the curbs will be available on a shorter 2-4 week
production cycle.
Call the Customer Service-Order Entry team at 1-800-235-9226 for
assistance.
Page 6
Global Unitary Systems
QuietCurb™
Q C U R B 2 0 3 0 P E Z2
RESTRAINT TYPE
C – CONVENTIONAL
Z2 – SEISMIC ZONE 1,2**
Z3 – SEISMIC ZONE 3**
Z4 – SEISMIC ZONE 4**
SOUND ATTENUATION
ROOFCURB (Product
Code 394) *
2030
4055
6075
9013
UNIT BASE SIZE
- 20 - 30 TON UNIT
- 40 - 55 TON UNIT
- 60 - 75 TON UNIT
- 90 - 130 TON UNIT
UNIT TYPE
P - PACKAGED ROOFTOP
W ITH CONDENSING
SECTION
HEATING OPTION
EFLSX-
ELECTRIC HEAT UNIT
NATURAL GAS HEAT
HOT W ATER HEAT
STEAM HEAT
EXTENDED CASING
DX COOLING ONLY
D - SPECIAL (CHILLED
W ATER OR OTHER)
A - ROOFTOP AIR HANDLER ***
** A full set of stamped calculations that are prepared by professional en g ineers for a specific
project, in its specific seismic region, may be obtained by adding a “J” as the last digit of the
ordering number. (Example: QCURB2030ADZ2J for a zone 2 seismic curb with job specific
calculations). For more information, contact ThyBar Corp. at 1-800-666-CURB.
*** If a chilled water air handler is ordered the complete model number must be provided to
identify coil type chosen / coordinate thru-the-curb piping locations.
Page 7
Global Unitary Systems
QuietCurb™ Applications
Frequency Inverters
Variable Frequency Drives (VFD) or frequency inverters are
recommended for air flow modulation (versus inlet guide vanes or
discharge dampers) where noise is a concern. Testing on the 40 ton unit
has shown that inverters modulate air flow more quietly than damper
controls. On the 40 ton unit, NC levels dropped as low as NC-26 - well
below normal background noise when an inverter was applied.
Flexible Connections
When applying the QuietCurb™ it is of utmost importance that all rigid
connections to the unit (i.e hot water piping, chilled water piping, steam
piping, natural gas piping, electrical conduit...etc.) integrate a flexible loop
or coupling connector to allow the spring isolators in the curb to "free
float". Any rigid connections to the unit will negate the benefit of the
spring curb causing it to "short circuit" transmitting vibration through the
rigid connections to the building structure.
USE FLEXIBLE TRANSITIONS OR COUPLINGS AT THE ROOFTOP
TO AVOID REGENERATED NOISE PROBLEMS.
Page 8
Trane Quiet Curb
Return Side Pressure Drop Data
Unit
Airflow
CFM
Return Side
Pressure
Drop (in. wg)
Supply Side
Pressure
Drop (in. wg)
Total Curb
Pressure
Drop (in. Wg)
20 - 25 - 30
4000
12000
17000
0.007
0.06
0.12
0.016
0.147
0.295
0.023
0.207
0.415
40 - 50 - 55
8000
16000
28000
0.017
0.069
0.211
0.057
0.226
0.693
0.074
0.295
0.904
60 - 70 - 75
12000
24000
33000
0.019
0.077
0.145
0.068
0.27
0.511
0.087
0.347
0.656
90 - 105 - 115 - 130
21000
36000
46000
0.025
0.074
0.121
0.103
0.303
0.494
0.128
0.377
0.616
Trane QuietCurb
Return Side Press. Drop Data
0.25
Return Side Pressure
Drop (in. w g)
0.15
Unit Airflows (CFM)
36000
21000
33000
24000
12000
28000
16000
8000
17000
12000
0
46000
90-130 T
60-75 T
0.05
40-55 T
20-30 T
0.1
4000
Press. Drop (in wg)
0.2
Trane QuietCurb
Supply Side Pressure Drop
Unit
Airflow
CFM
Supply Side
Pressure
Drop (in. wg)
20 - 25 - 30
4000
12000
17000
0.016
0.147
0.295
40 - 50 - 55
8000
16000
28000
0.057
0.226
0.693
60 - 70 - 75
12000
24000
33000
0.068
0.27
0.511
90 - 105 - 115 - 130
21000
36000
46000
0.103
0.303
0.494
Trane QuietCurb
Supply Side Pressure Drop Data
0.7
Supply Side Pressure
Drop (in. w g)
60-75 T
0.5
0.3
20-30 T
0.2
90-130 T
40-55 T
0.4
0.1
Unit Airflows (CFM)
36000
24000
16000
0
12000
Press. Drop (in. wg)
0.6
Trane QuietCurb
Total Curb Pressure Drop
Unit
Airflow
CFM
Total Curb
Pressure
Drop (in. Wg)
20 - 25 - 30
4000
12000
17000
0.023
0.207
0.415
40 - 50 - 55
8000
16000
28000
0.074
0.295
0.904
60 - 70 - 75
12000
24000
33000
0.087
0.347
0.656
90 - 105 - 115 - 130
21000
36000
46000
0.128
0.377
0.616
Trane QuietCurb
Total Curb Pressure Drop Data
1
Total Curb Pressure
Drop (in. Wg)
0.9
0.7
0.5
0.4
60-75 T
40-55 T
0.6
0.2
0.1
Unit Airflows (CFM)
36000
21000
33000
24000
12000
28000
16000
8000
17000
12000
0
46000
20-30 T
90-130 T
0.3
4000
Press. Drop (in. wg)
0.8
For standard curb sound data, see RT-EB-80.
COMMERCIAL PACKAGED ROOFTOP
WITH QUIETCURB
SX, SF, SE, SL, SS 20 & 25 Ton Supply Fan - Sound Power Levels
Discharge Lw, dB
CFM
TSP
RPM
63
125
250
500
1K
2K
Return Lw, dB
4K
8K
63
125 250 500
1K
2K
4K
8K
5000
5000
5000
5000
5000
5000
5000
5000
5000
5000
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
872
1000
1109
1206
1293
1374
1449
1519
1585
1648
80
82
84
85
87
88
90
91
91
92
71
74
76
77
79
80
81
82
83
84
58
61
63
65
66
68
69
69
70
71
54
56
58
58
60
61
62
62
63
64
51
54
56
57
58
59
60
61
62
62
48
50
52
53
54
55
56
57
57
58
44
47
49
51
52
53
54
55
56
56
42
46
48
50
51
52
53
54
55
56
73
76
77
79
81
82
83
85
86
86
68
71
73
74
76
77
78
79
80
81
61
64
65
67
69
70
71
72
73
74
58
60
62
63
64
65
67
67
68
69
55
58
61
62
64
65
66
67
68
68
54
57
60
61
63
64
65
66
67
68
47
50
53
55
56
58
59
60
61
62
43
47
50
52
54
55
57
58
59
60
7000
7000
7000
7000
7000
7000
7000
7000
7000
1.5
2
2.5
3
3.5
4
4.5
5
5.5
892
1018
1131
1233
1327
1413
1493
1567
1638
80
82
84
86
87
89
90
91
92
72
75
77
79
80
81
82
83
84
59
62
64
66
67
69
70
71
72
55
57
58
60
61
62
63
64
65
53
55
57
59
60
61
62
63
64
49
52
53
54
56
57
58
59
60
46
49
51
53
54
55
56
57
58
43
47
49
51
52
54
55
56
57
73
75
77
79
81
82
84
85
86
68
71
73
75
76
78
79
80
81
62
64
66
68
69
71
72
73
74
59
61
63
64
66
67
68
69
70
57
60
62
64
65
66
67
68
69
56
59
61
63
64
65
66
67
68
47
50
53
55
57
58
59
60
61
43
47
50
52
54
55
56
58
59
9000
9000
9000
9000
9000
9000
9000
9000
1.5
2
2.5
3
3.5
4
4.5
5
928
1038
1151
1252
1344
1431
1514
1591
81
82
84
86
88
89
90
91
73
75
78
79
81
82
83
84
61
63
65
67
68
69
70
71
57
58
60
61
62
63
65
65
54
57
59
60
61
62
63
64
51
53
54
56
57
58
59
60
49
51
53
54
55
56
57
58
45
48
50
52
53
54
55
56
74
75
77
79
81
82
83
85
69
71
73
75
77
78
79
80
63
65
66
68
70
71
72
73
60
62
64
65
67
68
69
70
58
61
63
65
66
67
68
69
57
59
62
63
65
66
67
68
48
51
53
55
57
58
59
61
44
47
50
52
53
55
56
57
11000
11000
11000
11000
11000
11000
11000
2
2.5
3
3.5
4
4.5
5
1088
1181
1271
1364
1452
1533
1609
83
85
86
88
89
90
92
77
79
80
81
83
84
85
65
66
67
69
70
71
72
60
61
62
63
64
65
66
58
60
61
62
63
64
65
54
56
57
58
59
60
61
53
54
55
56
57
58
59
49
51
52
54
55
56
57
76
77
79
81
82
83
84
72
74
76
77
78
80
81
65
67
69
70
71
73
74
63
65
66
67
68
70
70
62
64
65
67
68
69
70
61
62
64
65
67
68
69
52
54
55
57
58
60
61
48
50
52
53
55
56
57
EXHAUST FAN -------- Sound Power Levels
Return Lw, dB
CFM
TSP
RPM
63
125
250
500
1K
2K
4K
8K
4000
4000
4000
0.5
1
1.5
538
730
882
71
74
76
63
67
70
59
64
67
54
60
63
51
57
61
45
54
60
42
51
57
38
46
51
6000
6000
6000
0.5
1
1.5
570
765
912
71
74
76
64
68
71
61
66
69
57
62
65
53
60
63
48
56
62
44
53
59
40
48
53
8000
8000
8000
0.5
1
1.5
619
797
947
72
74
77
65
69
72
63
67
70
59
64
68
56
61
65
51
58
63
48
56
61
43
50
55
10000
10000
10000
0.5
1
1.25
712
837
911
73
75
76
68
70
72
66
68
70
63
66
67
60
63
65
56
60
63
53
58
60
48
52
55
COMMERCIAL PACKAGED ROOFTOP
WITH QUIET ROOFCURB
SX, SF, SE, SL, SS 30 Ton Supply Fan - Sound Power Levels
Discharge Lw, dB
CFM
TSP RPM
63
125
250
500
1K
Return Lw, dB
2K
4K
8K
63
125 250
500
1K
2K
4K
8K
8000
8000
8000
8000
8000
8000
8000
8000
8000
1.5
2
2.5
3
3.5
4
4.5
5
5.5
744
857
955
1041
1117
1186
1251
1311
1368
82
85
87
88
90
91
92
93
94
73
76
78
80
82
83
84
85
86
60
63
66
68
69
70
71
72
73
56
59
60
61
63
64
65
66
66
53
55
58
59
61
62
63
64
65
51
53
55
56
57
58
59
60
61
47
50
52
54
55
56
57
58
59
44
47
50
52
54
55
56
57
58
76
79
81
82
84
85
86
87
88
70
73
75
77
78
79
81
82
83
64
67
68
70
71
72
73
74
75
61
63
65
66
67
68
69
70
71
57
60
63
65
66
67
68
69
70
56
59
62
64
65
66
67
68
69
49
52
55
57
59
60
61
62
63
45
48
51
54
56
57
59
60
61
12000
12000
12000
12000
12000
12000
12000
12000
1.5
2
2.5
3
3.5
4
4.5
5
760
866
964
1053
1136
1213
1286
1354
83
85
87
88
90
91
92
94
74
77
79
81
83
84
85
86
61
64
66
68
70
71
73
74
57
60
61
63
64
66
67
68
55
57
59
61
63
64
65
66
52
54
55
57
59
60
61
62
49
51
54
55
57
58
59
60
45
48
51
53
55
56
58
59
76
78
80
82
83
85
86
87
71
73
76
77
79
80
81
82
65
67
69
70
72
73
74
75
62
64
66
67
68
69
71
72
59
62
64
66
68
69
70
71
58
60
63
65
66
68
69
70
49
52
55
57
59
60
62
63
44
48
51
53
55
57
58
60
13500
13500
13500
13500
13500
13500
13500
13500
1.5
2
2.5
3
3.5
4
4.5
5
779
875
969
1057
1138
1215
1288
1357
83
85
87
88
90
91
92
94
75
77
79
81
83
84
85
86
62
64
67
69
70
72
73
74
59
60
61
63
65
66
67
68
55
57
59
61
63
65
66
67
53
55
56
58
59
60
61
62
50
52
54
56
57
59
60
61
46
49
51
53
55
57
58
59
76
78
80
81
83
84
86
87
71
74
76
77
79
80
81
83
65
67
69
70
72
73
74
75
63
65
66
67
69
70
71
72
60
62
64
66
68
69
70
71
58
61
63
65
67
68
69
70
49
52
55
57
59
60
62
63
45
48
51
53
55
57
58
59
EXHAUST FAN -------- Sound Power Levels
Return Lw, dB
CFM
TSP RPM
63
125
250
500
1K
2K
4K
8K
6000
6000
6000
0.5
1
1.75
570
765
975
71
74
78
64
68
73
61
66
70
57
62
67
53
60
65
48
56
64
44
53
61
40
48
55
8000
8000
8000
0.5
1
1.75
619
797
1013
72
74
78
65
69
74
63
67
72
59
64
69
56
61
67
51
58
65
48
56
63
43
50
57
10000
10000
10000
0.5
1
1.75
712
837
1045
73
75
79
68
70
74
66
68
73
63
66
71
60
63
69
56
60
67
53
58
64
48
52
58
12000
12000
12000
0.5
1
1.25
806
905
956
74
75
76
70
72
73
68
70
71
66
68
69
63
65
67
61
64
65
58
61
62
53
55
57
COMMERCIAL PACKAGED ROOFTOP
WITH QUIETCURB
SX, SF, SE, SL, SS 40, 50, & 55 Ton Supply Fan - Sound Power Levels
Discharge Lw, dB
CFM
TSP RPM
63
125
250
500
1K
Return Lw, dB
2K
4K
8K
63
125
250
500
1K
2K
4K
8K
12000
12000
12000
12000
12000
12000
2
2.5
3
3.5
4
4.5
787
876
956
1030
1098
1160
86
88
89
91
92
93
77
80
81
83
84
85
64
67
69
71
72
73
60
62
63
64
66
67
56
58
60
62
62
63
54
55
57
58
59
60
50
53
54
56
57
58
48
51
53
55
56
57
81
83
84
85
87
88
75
77
79
80
81
82
68
70
71
72
73
75
64
66
67
68
69
71
60
63
65
66
67
68
59
62
64
65
67
68
54
56
59
60
62
63
50
53
55
57
59
60
18000
18000
18000
18000
18000
18000
1.5
2
2.5
3
3.5
4
725
812
893
969
1042
1110
85
87
88
89
91
92
77
79
80
82
84
85
64
66
68
70
71
72
60
62
63
64
65
67
56
58
59
61
62
63
54
55
57
58
59
60
50
52
54
56
57
58
47
50
52
54
55
57
79
81
82
84
85
86
73
75
77
79
80
82
66
68
70
71
73
74
64
66
67
68
69
70
59
62
64
66
67
68
58
61
63
64
66
67
52
54
57
59
60
62
47
50
53
55
57
59
20000
20000
20000
20000
20000
2
2.5
3
3.5
4
857
929
998
1064
1128
88
89
90
91
92
81
82
83
85
86
68
69
71
72
73
64
65
66
67
68
59
61
62
64
65
58
58
59
60
61
55
56
58
59
60
52
53
55
56
58
82
83
84
85
86
77
78
80
81
82
69
71
72
73
74
67
68
69
70
71
63
65
67
68
69
62
64
65
67
68
56
58
59
61
62
51
53
55
57
59
24000
24000
24000
24000
24000
2
2.5
3
3.5
4
926
983
1043
1102
1161
89
90
91
92
93
83
84
85
86
87
71
72
73
73
74
67
67
68
69
69
62
63
64
65
66
60
61
61
62
63
58
59
60
60
61
55
56
57
58
59
84
84
85
86
87
78
79
80
82
83
70
72
73
74
75
69
69
70
71
72
65
67
68
69
70
63
65
67
68
69
58
59
60
61
63
53
55
56
58
59
EXHAUST FAN -------- Sound Power Levels
CFM
9000
TSP RPM
63
125
250
500
1K
2K
4K
8K
0.5
499
76
67
63
61
57
51
47
43
9000
1
9000 1.75
618
812
78
80
70
75
67
72
65
70
62
67
57
65
53
62
49
57
12000 0.5
12000
1
12000 1.75
496
628
817
75
78
80
67
71
75
64
68
73
62
66
71
58
63
68
51
58
66
48
55
63
44
50
58
15000 0.5
15000
1
15000 1.75
567
667
824
76
78
80
70
72
75
67
70
73
65
68
72
62
65
69
56
60
66
53
57
64
49
53
58
18000 0.5
18000
1
18000 1.75
642
724
856
78
79
80
72
74
76
69
71
74
68
70
73
65
67
71
61
63
68
58
61
65
53
56
60
COMMERCIAL PACKAGED ROOFTOP
WITH QUIETCURB
SX, SF, SE, SL, SS 60, 70, & 75 Ton Supply Fan - Sound Power Levels
Discharge Lw, dB
CFM
TSP
RPM
63
125
250
500
1K
Return Lw, dB
2K
4K
8K
63
125
250
500
1K
2K
4K
8K
18000
18000
18000
18000
18000
18000
18000
18000
18000
1.5
2
2.5
3
3.5
4
4.5
5
5.5
633
718
791
855
913
966
1016
1063
1107
84
87
88
90
91
92
92
93
94
80
82
84
85
87
88
89
90
90
65
67
69
71
72
73
74
75
76
60
62
64
65
66
67
67
68
69
55
56
58
59
61
62
63
64
64
53
54
56
57
58
59
59
60
61
51
53
55
56
57
58
59
60
61
48
50
52
54
56
57
58
59
60
79
82
83
84
86
86
87
88
89
73
76
78
79
81
82
83
84
85
66
69
70
72
73
74
75
76
77
63
65
67
68
69
70
71
72
72
58
60
62
64
65
67
68
69
69
57
59
62
63
65
66
67
68
69
52
55
57
59
61
62
63
64
65
48
51
53
56
58
59
61
62
63
24000
24000
24000
24000
24000
24000
24000
24000
1.5
2
2.5
3
3.5
4
4.5
5
659
746
821
889
951
1008
1060
1109
85
87
89
90
91
92
93
94
81
84
85
87
88
89
90
91
66
69
71
72
74
75
76
77
63
64
65
67
68
69
70
71
56
57
60
62
63
64
65
66
54
56
58
59
60
61
62
62
53
55
57
58
60
61
61
62
49
52
54
56
58
59
60
61
80
82
84
85
86
87
88
89
74
77
79
80
81
83
84
85
67
69
71
72
74
75
76
77
64
67
68
69
70
71
72
73
59
62
64
65
67
68
69
70
58
61
63
65
66
67
68
69
53
55
58
60
61
63
64
65
48
51
54
56
58
60
61
62
28000
28000
28000
28000
28000
28000
2
2.5
3
3.5
4
4.5
763
839
907
969
1028
1082
88
89
90
92
93
94
84
86
88
89
90
91
70
72
73
75
76
77
65
67
68
69
70
71
59
61
62
64
65
66
58
58
60
61
62
63
56
58
59
61
62
63
53
55
57
58
60
61
82
84
85
86
87
88
77
79
81
82
83
84
70
72
73
74
75
76
67
69
70
71
72
73
62
65
66
68
69
70
61
63
65
67
68
69
56
58
60
62
63
64
51
54
56
58
60
61
32000
32000
32000
32000
32000
32000
2
2.5
3
3.5
4
4.5
802
858
924
988
1046
1100
89
90
91
92
93
94
86
87
89
90
91
92
72
72
74
75
76
77
67
68
69
70
71
72
61
62
63
65
66
67
59
60
61
62
63
64
58
59
61
62
63
64
55
56
58
59
60
61
84
84
85
86
88
89
78
80
81
82
84
85
71
72
73
74
75
77
69
70
71
72
73
74
64
65
67
68
70
71
62
64
66
67
68
70
57
59
60
62
63
65
52
54
57
58
60
61
EXHAUST FAN -------- Sound Power Levels
Return Lw, dB
CFM
TSP
RPM
63
125
250
500
1K
2K
4K
8K
12000
0.5
423
73
66
60
57
53
52
49
12000
1
572
79
73
67
65
61
60
57
43
51
12000
1.75
740
84
78
73
71
68
66
63
57
18000
0.5
516
78
72
66
64
60
59
57
51
18000
1
607
81
75
69
67
63
62
59
53
18000
1.75
766
85
80
74
72
69
67
64
58
21000
0.5
578
81
75
69
67
64
63
60
55
21000
1
647
82
77
71
69
65
64
61
55
21000
1.75
781
86
80
75
72
69
68
65
59
27000
0.5
711
86
81
75
73
70
69
67
62
27000
1
761
86
81
75
73
70
69
66
61
27000
1.75
844
88
83
77
74
71
70
67
62
COMMERCIAL PACKAGED ROOFTOP
WITH QUIETCURB
SX, SF, SE, SL, SS 90 Ton Supply Fan - Sound Power Levels
Discharge Lw, dB
CFM
TSP
RPM
63
125
250
500
1K
2K
Return Lw, dB
4K
8K
63
125
250
500
1K
2K
4K
8K
27000
27000
27000
27000
27000
27000
27000
27000
27000
2.5
3
3.5
4
4.5
5
5.5
6
6.5
992
1053
1111
1167
1223
1277
1330
1382
1434
85
86
87
87
88
89
91
92
93
80
80
81
82
83
84
85
86
87
71
73
74
76
77
78
79
81
82
66
68
68
69
70
71
72
73
74
61
61
62
64
65
66
66
67
68
55
56
56
57
58
59
60
61
62
51
53
54
55
56
57
58
59
60
46
48
49
50
52
53
54
55
56
79
79
80
80
81
82
83
84
84
73
74
74
75
76
77
78
79
80
72
74
75
77
78
79
81
82
83
64
65
66
67
68
69
71
72
73
58
59
60
62
63
64
65
66
67
58
59
60
61
62
63
64
64
65
58
59
59
60
60
61
61
62
62
47
48
49
50
50
51
52
53
54
37000
37000
37000
37000
37000
37000
37000
37000
37000
2.5
3
3.5
4
4.5
5
5.5
6
6.5
1156
1204
1253
1300
1343
1386
1431
1475
1517
87
87
88
88
89
90
90
91
92
83
83
83
84
84
85
85
86
87
77
78
79
80
80
81
82
83
84
71
72
73
73
74
74
75
76
76
65
66
66
67
68
68
69
70
71
57
58
59
60
61
61
62
62
63
55
56
57
58
58
59
60
61
61
50
51
52
53
54
55
56
57
58
80
80
81
81
82
82
83
83
84
75
76
76
77
77
78
78
79
79
77
78
79
80
81
82
82
83
84
67
68
69
70
70
71
72
73
73
62
63
63
64
65
66
67
67
68
60
61
62
63
63
64
64
65
65
59
60
60
60
61
61
61
61
62
49
49
50
51
51
52
53
54
54
45000
45000
45000
45000
45000
45000
45000
45000
2.5
3
3.5
4
4.5
5
5.5
6
1302
1348
1390
1430
1470
1509
1549
1587
88
89
89
90
90
91
91
92
85
85
86
86
86
87
87
87
81
82
83
83
84
85
86
87
75
76
76
77
77
78
78
79
69
70
70
71
71
72
73
73
61
62
62
62
63
63
64
64
58
59
60
60
61
61
62
63
54
55
56
56
57
58
59
59
81
82
82
82
83
83
84
84
77
77
78
78
79
79
80
80
80
81
82
83
83
84
85
86
70
71
72
72
73
73
74
74
65
66
66
67
67
68
69
69
63
63
64
64
65
65
65
66
60
61
61
61
61
61
61
62
51
51
52
53
53
54
54
55
EXHAUST FAN -------- Sound Power Levels
Return Lw, dB
CFM
TSP RPM 63
125 250 500 1K 2K 4K 8K
27900
27900
27900
27900
0.25
0.75
1.5
2.5
520
580
690
800
83
84
87
91
76
76
79
82
73
73
76
78
70
71
74
76
68
69
72
75
71
69
70
73
68
65
65
68
61
59
59
62
35100
35100
35100
35100
0.25
0.75
1.5
2.5
630
690
770
880
88
88
91
94
81
81
82
85
78
78
79
81
77
77
78
80
75
75
77
79
75
73
74
76
71
69
69
71
63
61
62
64
41400
41400
41400
41400
0.25
0.75
1.5
2.5
745
780
860
950
93
92
94
96
85
84
85
87
83
82
83
84
82
81
82
84
80
79
81
82
80
77
78
78
76
73
73
72
67
65
66
65
COMMERCIAL PACKAGED ROOFTOP
WITH QUIETCURB
SX, SF, SE, SL, SS 105, 115, & 130 Ton Supply Fan - Sound Power Levels
Discharge Lw, dB
CFM
TSP
RPM
63
125
250
500
1K
2K
Return Lw, dB
4K
8K
63
125
250
500
1K
2K
4K
8K
31000
31000
31000
31000
31000
31000
31000
31000
31000
2.5
3
3.5
4
4.5
5
5.5
6
6.5
1054
1109
1160
1213
1265
1314
1362
1410
1457
85
86
87
88
89
89
90
91
92
81
82
82
82
83
84
85
86
86
74
75
76
77
78
79
80
81
82
69
70
70
71
72
72
73
74
75
63
64
64
65
66
67
68
68
69
57
58
58
59
60
60
60
61
62
53
54
55
56
57
58
58
59
60
48
49
50
52
53
54
55
56
57
79
80
80
81
81
82
82
83
84
74
74
75
76
76
77
78
78
79
74
75
77
78
79
80
81
82
83
65
66
67
68
69
70
71
72
72
60
61
61
62
63
64
65
66
67
59
60
61
62
62
63
64
64
65
59
59
60
60
60
61
61
62
62
48
48
49
50
51
51
52
53
54
39000
39000
39000
39000
39000
39000
39000
39000
39000
2.5
3
3.5
4
4.5
5
5.5
6
6.5
1192
1239
1284
1330
1374
1416
1456
1499
1541
88
88
89
89
89
90
90
91
92
84
84
84
84
85
85
86
86
87
78
79
80
80
81
82
83
84
85
72
73
74
74
75
75
76
76
77
67
67
68
68
69
69
70
71
71
59
60
60
61
61
62
63
63
64
56
57
57
58
59
60
60
61
62
51
52
53
54
55
56
57
58
58
80
81
81
81
82
82
83
83
84
76
76
76
77
77
78
78
79
80
78
79
80
80
81
82
83
84
85
68
69
70
70
71
72
72
73
74
63
63
64
65
66
66
67
68
68
61
62
62
63
64
64
65
65
66
60
60
60
61
61
61
61
61
62
49
50
50
51
52
52
53
54
55
46000
46000
46000
46000
46000
46000
46000
3
3.5
4
4.5
5
5.5
6
1366
1408
1448
1487
1525
1564
1602
89
90
90
91
91
92
92
86
86
86
86
87
87
88
82
83
84
85
86
87
88
76
77
77
78
78
79
79
70
71
71
72
72
73
73
62
63
64
64
64
64
65
59
60
61
61
62
62
63
55
56
57
57
58
59
60
82
82
83
83
84
84
85
77
78
78
79
79
80
80
81
82
83
84
85
86
86
71
72
73
73
74
74
75
66
66
67
68
68
69
70
63
64
64
65
65
66
66
61
61
61
61
61
61
62
52
52
53
53
54
55
55
EXHAUST FAN -------- Sound Power Levels
Return Lw, dB
CFM
TSP RPM 63
125 250 500 1K 2K 4K 8K
24300
24300
24300
24300
0.25
0.75
1.5
2.5
460
540
650
800
80
82
85
90
73
74
77
81
69
71
73
77
66
68
71
75
64
66
69
74
68
67
68
73
66
64
64
68
60
58
58
62
33300
33300
33300
33300
0.25
0.75
1.5
2.5
610
660
750
865
87
87
90
93
80
80
81
84
77
77
78
81
75
75
77
79
73
73
75
78
74
72
73
76
71
67
68
71
63
60
61
64
40500
40500
40500
40500
0.25
0.75
1.5
2.5
730
770
845
940
92
92
94
96
84
84
85
86
82
81
82
84
82
81
81
83
80
79
80
82
79
77
78
78
75
72
73
72
67
65
65
65
************************************************************************
The following file is for the competitive specifying of the
Trane QuietCurb Rooftop Accessory
"F" and "G" Development Sequence IntelliPak Packaged Rooftops
and / or
the IntelliPak Rooftop Air Handler
Edit this specification to fit the project requirements. This spec contains notes to the SPECIFIER
and offers alternative word selections. (#) and (*) symbols designate VALUE ADDED and
PROPRIETARY requirements. A spec brief follows this specification describing the value of
value added and proprietary paragraphs.
>>>>>>>>>DELETE SPEC BRIEF FROM FINAL DOCUMENT<<<<<<<<<<<
************************************************************************
10/94
SECTION 15050
ROOF SUPPORT FOR MECHANICAL EQUIPMENT
PART 1
GENERAL
1.01
SECTION INCLUDES
A.
1.02
Rooftop unit acoustical curb with integral spring-vibration isolation rail
and offset-outlet, low velocity air flow plenum path.
RELATED SECTIONS
A.
Section 15010 - General Provisions
B.
Section 15240 - Vibration Isolation
1.03
A.
SUBMITTALS
Submit drawings indicating dimensions of curb and locations and sizes of
supply air discharge and return air openings.
# B.
Submit manufacturer's product data, including supply discharge and return
side octave band sound power levels, measured in accordance with AMCA
300-85, indicating sound power level performance for the roofcurb-rooftop
unit as a combined system. Duct end reflection loss corrections shall be
made per AMCA 300-85. Octave band sound power levels shall not
exceed those specified on the contract documents.
C.
PART 2
Submit manufacturer's installation instructions.
PRODUCTS
2.01
MANUFACTURERS
# A.
Provide Trane QuietCurb  or approved alternate by Custom Curb Inc.
or Micro Metl. Alternates must include high density sheathing in the base
of the curb, spring-vibration isolation rail, low velocity air flow patterning,
and be lined internally with minimum 4" insulation containing a perforated
liner backing. The curb must comply with the sound power level
performance and features specified herein and as indicated on the contract
documents.
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OR
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# A.
Manufacturer of rooftop units [rooftop air handlers] shall provide
acoustical curbs to form a complete and matched rooftop system with
documented octave band sound power performance.
*********
OR
*********
* A.
Provide Trane QuietCurb  .
2.02
ROOFCURBS
A.
Roofcurb shall be prefabricated, non-combustible construction with
sealing gasket around perimeter members to insure air/water tight
integrity. The curb shall be constructed of minimum 14 ga. galvanized
steel structural members with minimum 20 ga. galvanized steel
flashing with overlapping continuous rubber counterflashing. Curb shall
be furnished with a 2" X 2" nailer strip for attaching roofing felts. The
base of the curb shall contain acoustically non-conductive floor pans with
the supply and return air openings framed for duct attachment (duct must be
supported independent of curb and flex connected).
B.
Curb shall incorporate integral spring-vibration isolation rail
with adjustable 1" deflection isolators, properly sized and selected for unit
point loading. Spring isolators shall have a minimum of 90% isolation
efficiency.
# C.
Roofcurb shall be shipped [fully assembled from the manufacturing site]
[and] seismically isolated with [vertically stabalized] spring isolators
[incorporating vertical limit stops].
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The following paragraph applies to packaged rooftops only - not roof
mounted air handling units
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# D.
The curb shall be designed to provide pedestal support for an open
(no base pan constructed) condensing section. Full perimeter supported
condensing sections shall not be permitted.
PART 3 - EXECUTION
3.01
INSTALLATION
A.
Install the roofcurb in accordance with manufacturer's recommendations
and as shown on the construction documents.
B.
Coordinate piping and power entry locations with other trades. Supporting
structural framing shall be sized and installed as indicated on the
construction documents. Submit shop drawings to the Architect, with
point loadings and curb layout, for approval, prior to beginning work.
END OF SECTION
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1.03, B.
2.01, A.
Requiring published sound data to document performance of the roofcurb-rooftop "system"
eliminates the guesswork involved to engineer a quiet job for the customer. Vendor products
which cannot provide documentation for the real world performance of the combination curb-unit
should not be allowed.
2.01, A.
"QuietCurb" is a proprietary feature THAT WORKS producing up to 18 NC reductions in sound
power levels (depending on size). Let the OWNER make the buying decision based upon
unprecedented performance in quiet comfort!
2.02, C.
QuietCurb is unique in that the product is shipped fully assembled from the manufacturing point
directly to the job site. This feature is beneficial for jobs with tight schedules or replacement
opportunities that have been plagued with poor acoustic performance.
2.02, D.
Manufacturer's which do not have open (no base pan constructed) condensing sections should not
be allowed to bid. If allowed, the base pan in the condensing section can resonate, amplifying
compressor noise. Designs without the base pan eliminate the "drum head" potential and allow
compressor noise to break out above the roof line. Whereas, full perimeter base pan designs
radiate and reflect the noise directly into the ceiling space below.