®
3900 Dr. Greaves Rd.
•
Kansas City, MO 64030
•
(816) 761-7476
•
FAX (816) 765-8955
AIR PERFORMANCE DATA
FOR ALL COMBINATION FIRE AND SMOKE AND SMOKE DAMPERS
The air performance of a damper is described by the pressure drop
across the damper. So what is pressure drop? Pressure drop can be
defined as the resistance to airflow across an open damper and
increases as turbulent flow increases. Ruskin's pressure drop testing was conducted in accordance with AMCA Standard 500 using
figure 5.3 (shown at right). All data has been corrected to represent
standard air at a density of .075 lb/ft. Actual pressure drop is
dependent upon many factors. This pressure drop information along
with an analysis of other system influences should be used to estimate actual pressure losses for a damper installed in a given HVAC
system.
Figure 5.3 (above) illustrates a fully ducted damper.
For AMCA Certified Ratings Air Performance information refer to the damper model specification sheet.
PERFORMANCE DATA FOR SD and FSD60, 60-2, 60-3, 60-V, 60M, 60-3M, 37
To determine the pressure drop:
Formula
1. Select the damper free area factor based on the damper width
and height (A x B) from the chart.
2. Solve the formula using the free area factor.
3. For installations where damper is not installed in ductwork,
multiply static pressure drop obtained from the formula by
2.8 + V FREE AREA FACTOR
LP =
Vel. =
CFM =
Pressure drop in inches w.g.
Duct Velocity in feet per minute
Duct area (sq. ft.) x Vel. (fpm)
FREE AREA FACTOR
Height
Damper B
Dim.
8
10
12
14
16
18
20
24
28
32
36
40
44
48
Width - Damper A Dim.
8
12
16
20
24
28
30
0.17
0.24
0.29
0.32
0.39
0.44
0.51
0.64
0.78
0.91
1.03
1.18
1.30
1.42
0.29
0.42
0.51
0.55
0.68
0.77
0.90
1.11
1.37
1.58
1.79
2.05
2.26
2.47
0.42
0.60
0.72
0.79
0.98
1.09
1.28
1.58
1.95
2.25
2.55
2.93
3.23
3.53
0.54
0.78
0.94
1.03
1.27
1.42
1.66
2.05
2.53
2.93
3.32
3.80
4.19
4.59
0.67
0.97
1.15
1.26
1.56
1.74
2.04
2.52
3.12
3.60
4.08
4.68
5.16
5.64
0.79
1.15
1.37
1.50
1.85
2.07
2.42
3.00
3.70
4.27
4.85
5.55
6.12
6.70
0.86
1.24
1.47
1.62
2.00
2.23
2.61
3.23
3.99
4.61
5.23
5.99
6.61
7.22
Spec FSDPDD-511/Replaces FSDPDD-309
ALL STATED SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE OR OBLIGATION.
© Ruskin 2011
PERFORMANCE DATA FOR SD AND FSD36, 35
To determine the pressure drop:
Formula
1. Select the damper free area factor based on the damper width
and height (A x B) from the chart.
2. Solve the formula using the free area factor.
3. For installations where damper is not installed in ductwork,
multiply static pressure drop obtained from the formula by
2.8 + V FREE AREA FACTOR
LP =
Vel. =
CFM =
Pressure drop in inches w.g.
Duct Velocity in feet per minute
Duct area (sq. ft.) x Vel. (fpm)
FREE AREA FACTOR
Height
Damper B
Dim.
8
10
12
14
16
18
20
24
28
32
36
40
44
48
Width - Damper A Dim.
8
12
16
20
24
28
32
36
0.18
0.23
0.30
0.33
0.40
0.44
0.53
0.62
0.78
0.93
1.05
1.19
1.32
1.45
0.31
0.40
0.53
0.58
0.69
0.77
0.92
1.09
1.35
1.62
1.83
2.08
2.31
2.52
0.45
0.57
0.76
0.82
0.99
1.10
1.32
1.55
1.93
2.31
2.61
2.96
3.29
3.60
0.58
0.74
0.98
1.07
1.28
1.43
1.71
2.01
2.50
2.99
3.39
3.85
4.28
4.68
0.71
0.91
1.21
1.32
1.58
1.76
2.11
2.48
3.08
3.68
4.18
4.73
5.26
5.75
0.85
1.08
1.53
1.56
1.87
2.09
2.50
2.94
3.66
4.37
4.96
5.62
6.25
6.83
0.98
1.25
1.66
1.81
2.17
2.42
2.89
3.40
4.23
5.06
5.74
6.50
7.23
7.91
1.12
1.42
1.88
2.06
2.46
2.75
3.29
3.87
4.81
5.75
6.52
7.39
8.21
8.98
PERFORMANCE DATA FOR SD50
To determine the pressure drop:
Formula
1. Select the damper free area factor based on the damper width
and height (A x B) from the chart.
2. Solve the formula using the free area factor.
3. For installations where damper is not installed in ductwork,
multiply static pressure drop obtained from the formula by
2.8 + V FREE AREA FACTOR
LP =
Vel. =
CFM =
Pressure drop in inches w.g.
Duct Velocity in feet per minute
Duct area (sq. ft.) x Vel. (fpm)
FREE AREA FACTOR
Height
Damper B
Dim.
8
10
12
14
16
18
20
24
28
32
36
40
44
48
Width - Damper A Dim.
8
12
16
20
24
28
32
36
0.18
0.24
0.31
0.35
0.41
0.48
0.56
0.69
0.82
0.97
1.10
1.23
1.36
1.51
0.32
0.42
0.55
0.61
0.71
0.83
0.97
1.20
1.43
1.69
1.91
2.14
2.37
2.63
0.45
0.59
0.78
0.87
1.01
1.20
1.38
1.71
2.03
2.41
2.73
3.06
3.38
3.75
0.59
0.77
1.01
1.13
1.31
1.56
1.80
2.22
2.64
3.12
3.55
3.97
4.39
4.87
0.72
0.95
1.24
1.39
1.62
1.91
2.21
2.73
3.25
3.84
4.36
4.88
5.40
6.00
0.86
1.12
1.48
1.66
1.92
2.27
2.62
3.24
3.86
4.56
5.18
5.80
6.41
7.12
0.99
1.30
1.71
1.92
2.22
2.63
3.04
3.75
4.47
5.28
6.00
6.71
7.42
8.24
1.13
1.48
1.94
2.18
2.52
2.99
3.45
4.26
5.07
6.00
6.81
7.62
8.43
9.36