Retrotec DucTester 341 User Manual
Page 60
Page 60 of 83
©Retrotec Inc. 2014
Average Operating
Pressure (Pa)
Multiplier for
CFM25
45
1.42
50
1.52
55
1.60
60
1.69
65
1.77
70
1.85
75
1.93
80
2.01
85
2.08
90
2.16
95
2.23
100
2.30
105
2.37
110
2.43
115
2.50
120
2.56
125
2.63
130
2.69
135
2.75
140
2.81
145
2.87
150
2.93
155
2.99
160
3.05
165
3.10
170
3.16
175
3.21
180
3.27
185
3.32
190
3.38
195
3.43
200
3.48
When possible, use actual operating conditions to determine the best multiplier to use from the table
above.
Calculate a loss factor for supply and return leaks
Supply Loss Factor = (SLS x SLP x SPM)
Where: SLS is Supply Leakage Split (default 0.5)
SLP is Supply Leakage Penalty (default 1.0)
SPM is Supply Pressure Multiplier (default 1.0)
Supply Loss Factor
= 0.5 * 1.0 * 1.0
= 0.5