OM0284
Page 50 of 72
Rev 2 July/2021
Alternate Procedure:
The alternative procedure to determine inflow velocity uses a thermo anemometer in a constricted window access
opening of 3 inches (76mm) with the armrest removed. Inflow air velocity is measured in the center of the constricted
opening 1-1/2 inches (38mm) above the work access opening on the following specified grid. Use the correction factor
table to calculate the inflow velocity.
c. Test Data - Inches (mm):
1. DIM Measurement
Inflow Volume
ft.
3
/min.(m
3
/s)
Access Opening
ft.
2
(m
2
)
Inflow Velocity
ft./min(m/s)
2. Constricted 3 inch (76mm) high access opening measurement - Inches (mm):
300E
4
(102)
8.3966
(213)
12.792
(325)
17.188
(437)
21.584
(548)
25.980
(660)
30.375
(771)
400E
4
(102)
8.264
(210)
12.528
(318)
16.792
(426)
21.056
(535)
25.320
(643)
29.584
(751)
33.848
(860)
38.112
(968)
42.375
(1076)
500E
4
(102)
8.198
(208)
12.396
(315)
16.594
(421)
20.792
(528)
24.990
(635)
29.188
(741)
33.386
(848)
37.584
(955)
41.782
(1061)
45.980
(1168)
50.178
(1274)
54.375
(1381)
600E
4
(102)
8.158
(207)
12.316
(313)
16.474
(481)
20.632
(524)
24.790
(630)
28.948
(735)
33.106
(841)
37.264
(946)
41.422
(1052)
45.580
(1158)
49.738
(1263)
53.896
(1369)
58.054
(1475)
62.212
(1580)
66.375
(1686)
Number of Readings:
Average Velocity of Constricted Area
ft./min.(ms)
1.
Average Velocity of Constricted Area
fpm (m/s)
2.
X
Constricted Access Area
ft
2
(m
2
)
3.
=
Constricted Area Volume
CFM(m
3
/s)
4.
Constricted Area Volume
CFM(m
3
/s)
5.
10”(254)
Access Window Area
ft
2
(m
2
)
6.
=
Average Velocity of
10”(254)
Access Window Area
fpm (m/s)
7.
Average Velocity of
10”(254)
Access Window Area
fpm (m/s)
8.
X
Correction Factor for Window Height
9.
=
Average Inflow Velocity
fpm (m/s)
d. Acceptance Criteria: Access Opening Inflow Velocity =
105 LFPM
5 LFPM (.53 m/s
.025 m/s)
Areas/Correction Factors for Calculations
Cabinet
Size
Window Access Opening
Correction
Factor For
3" (76mm)
Constricted
10" (254mm)
10"(254mm)
Window
300E
.72
(.067)
2.39
(.222)
1.01
400E
.97
(.090)
3.22
(.299)
1.0
500E
1.22
(.113)
4.05
(.376)
1.0
600E
1.47
(.137)
4.89
(.454)
1.02
Содержание LabGard NU-543-300E
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