NuAire LabGard NU-560-400, Operation & Maintenance Manual

Page: 64 / 103

OM0295
Rev 2 September 2020 Page 64 of 103
Areas/Correction Factors for Calculations
Cab.
Size
3” (76mm) Constricted Window
Access Area ft2, (m2)
8” (203mm) Window Access
Opening Area ft2, (m2)
Correction Factor for 8”
(203mm) Window
Work Zone Area
ft2, (m2)
400
.97
(.090)
2.58
(.239)
.97
7.81
(.781)
600
1.47
(.137)
3.91
(.363)
.98
11.85
(1.101)
Table 7.1
Certification Values
The following are recommended minimum/maximum cabinet airflow certification setpoints per NSF/ANSI 49. NuAire
recommends, however, operation at the stated average flow, for ease of maintenance and annual certification.
THE FOLLOWING EXHAUST FLOWS ARE FOR AN 8 INCH (203MM) WORK ACCESS OPENING:
NOTE: 1: NuAire recommends the cabinet be set up and certified at the stated nominal average inflow .
EXAMPLE :
NU-560-400 Inflow Volume Measurement / Calibration
1) Inflow volume measured with DIM at cabinet face with blower on and downflow velocity approximately at 60 fpm
(.30 m/s), inflow volume = 271cfm (460 CMH).
2) Inflow supply volume = exhaust volume
271cfm (460CMH) + 469cfm (797CMH) = 740cfm (1257CMH)
3) So, based on the inflow measurement volume and adding the supply volume from the table for the nominal
average velocity, the calibrated exhaust value entered should be 740cfm (1257CMH).
NOTE: 2: For additional guidance, the values provided below with a constant 60fpm (.30mls) downflow velocity can be
used for exhaust adjustment.
NU-560-400 NU-560-600
Inflow Volume Inflow Velocity Exhaust Volume Inflow Volume Inflow Velocity Exhaust Volume
258 100 727 391 100 1102
263 102 732 399 102 1110
268 104 737 407 104 1118
271 105 740 411 105 1122
274 106 743 415 106 1126
279 108 748 422 108 1133
284 110 753 430 110 1141
Parameter Minimum Stated Nominal Maximum
Acceptable Flow Average Flow Acceptable Flow
NU-560-400
1. Inflow Avg. Velocity 100 (.51 m/s) FPM 105 (.53 m/s) FPM 110 (.56 m/s) FPM
2. Inflow Volume 258 (438 CMH) CFM 271 (460 CMH) CFM 284 (483 CMH) CFM
3. Supply Avg. Velocity 55 (.27 m/s) FPM 60 (.30 m/s) FPM 65 (.33 m/s) FPM
4. Supply Volume 430 (731 CMH) CFM 469 (797 CMH) CFM 508 (863 CMH) CFM
5. Total Volume 688 (1169 CMH) CFM 740 (1257 CMH) CFM 792 (1346 CMH) CFM
NU-560-600
1. Inflow Avg. Velocity 100 (.51 m/s) FPM 105 (.53 m/s) FPM 110 (.56 m/s) FPM
2. Inflow Volume 391 (664 CMH) CFM 411(698 CMH) CFM 430 (731 CMH) CFM
3. Supply Avg. Velocity 55 (.27 m/s) FPM 60 (.30 m/s) FPM 65 (.33 m/s) FPM
4. Supply Volume 652 (1108 CMH) CFM 711 (1208 CMH) CFM 770 (1308 CMH) CFM
5. Total Volume 1043 (1772 CMH) CFM 1122 (1906 CMH) CFM 1200 (2039 CMH) CFM
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