OM0228 Page60of99
February/2014
ModelNumber SupplyVolumeCorrectionFactor
NU‐430‐400 Averagedownflowvelocityplus(4fpm)
NU‐430‐600 Averagedownflowvelocity
I.E. NU‐430‐400
Averagedownflowvelocity=60fpm
Averagesupplyvolumevelocity=60+4=64fpm
Supplyvolume=64x7.57=484CFM
c. TestData–Inches(mm):
1. DIMMeasurement
InflowVolume
ft.
3
/min.(m
3
/s) ÷AccessOpeningAreaft.
2
(m
2
) =InflowVelocityft./min(m/s)
InflowVolumeft.
3
/min.(m
3
/s) +SupplyVolumeft.
3
/min.(m
3
/s)
=TotalExhaustft.
3
/min.(m
3
/s)
Volume
2. Constricted3inch(76mm)highaccessopeningmeasurement‐Inches(mm):
400
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)
600
4
(102)
8.158
(207)
12.316
(313)
16.474
(418)
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)
NumberofReadings: AverageVelocityofConstrictedAreaft./min.(mps)
1. AverageVelocityofConstrictedArea fpm(m/s)
2. X ConstrictedAccessArea ft
2
(m
2
)
3. =ConstrictedAreaVolume CFM(m
3
/s)
4. Constricted AreaVolume CFM(m
3
/s)
5.
8"(203mm)AccessWindowArea ft
2
(m
2
)
6. = AverageVelocityof8"(203mm)AccessWindowArea fpm(m/s)
7. AverageVelocityof8"(203mm)AccessWindowArea fpm(m/s)
8. X CorrectionFactorfor8"(203mm)Window
9. = AverageInflowVelocity fpm(m/s)
d. AcceptanceCriteria:Accessopeninginflowvelocity=100to110fpm(.51to.56m/s)
Areas/CorrectionFactorsforCalculations
Cab.
Size
3”(76mm)ConstrictedWindow
AccessAreaft
2
,(m
2
)
8”(203mm)WindowAccess
OpeningAreaft
2
,(m
2
)
CorrectionFactorfor8”
(203mm)Window
WorkZoneArea
ft
2
,(m
2
)
400
.97
(.090)
2.58
(.239)
1.0
7.57
(.703)
600
1.47
(.137)
3.91
(.363)
1.05
11.48
(1.066)
I.E. NU‐430‐600
Averagedownflowvelocity=60fpm
Averagesupplyvolumevelocity=60fpm
Supplyvolume60x11.48=689CFM
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