NuAire LabGard ES NU-565-400, Operation & Maintenance Manual

Page: 65 / 105

OM0301
August 20 Page 65 of 105
I.E. NU-565-400
Average downflow velocity = 60 fpm
Average supply volume velocity = 60 fpm
Supply volume = 60 x 7.81 = 469 CFM
c. Test Data – Inches (mm):
1. DIM Measurement
Inflow Volume ft. 3 /min. (m 3 /s) ÷ Access Opening Area ft. 2 (m 2 ) = Inflow Velocity ft./min (m/s)
Inflow Volume ft.
3
/min. (m
3
/s) + Supply Volume ft.
3
/min. (m
3
/s)
= Total Exhaust ft. 3 /min.
(m
3
/s)
Volume
2. Constricted 3 inch (76mm) high access opening measurement - Inches (mm):
40
0
4
(102
)
8.26
4
(210)
12.52
8
(318)
16.79
2
(426)
21.05
6
(535)
25.32
0
(643)
29.58
4
(751)
33.84
8
(860)
38.11
2
(968)
42.37
5
(1076)
60
0
4
(102
)
8.15
8
(207)
12.31
6
(313)
16.47
4
(418)
20.63
2
(524)
24.79
0
(630)
28.94
8
(735)
33.10
6
(841)
37.26
4
(946)
41.42
2
(1052)
45.58
0
(1158)
49.73
8
(1263)
53.89
6
(1369)
58.05
4
(1475)
62.21
2
(1580)
66.37
5
(1686)
Number of Readings: Average Velocity of Constricted Area ft./min. (mps)
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.
÷
8" (203mm) Access Window Area ft 2 (m 2 )
6. = Average Velocity of 8" (203mm) Access Window Area fpm (m/s)
7. Average Velocity of 8" (203mm) Access Window Area fpm (m/s)
8. X Correction Factor for 8" (203mm) Window
9. = Average Inflow Velocity fpm (m/s)
10. Average Inflow Velocity fpm (mps)
X Access Opening Area ft 2 (m 2 )
= Inflow Volume ft 3 /min.(m 3 /s)
11. Inflow Volume ft 3 /min.(m 3 /s)
+ Supply Volume ft 3 /min.(m 3 /s)
= Total Exhaust Volume ft 3 /min.(m 3 /s)
d. Acceptance Criteria: Access opening inflow velocity = 100 to 110 fpm (.51 to .56 m/s)
I.E. NU-565-600
Average downflow velocity = 60 fpm
Average supply volume velocity = 60 fpm
Supply volume 60 x 11.85 = 711 CFM