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" C o m p l e t e A i r C o n t r o l a n d D i s t r i b u t i o n S o l u t i o n s . "
w w w . n a i l o r . c o m
7-11-22 IOM-VAVK-2 (Supersedes NEW)
Model Series:
30HQX Single Duct Exhaust (Hospital Grade)
30X
Single Duct Exhaust
Equations:
Q = K x
∆
P
∆
P =
(
___
)
2
F =
(
________
)
2
Where: Q = Airflow Rate (cfm)
∆
P = Sensor Differential Pressure ("w.g.)
K = K-Factor Calibration Constant (standard air)
F = Amplification Factor (sensor gain)
A = Nom. Duct Area (sq. ft.)
The K-Factors tabulated in the above tables are the
airflow required to produce a 1.0" w.g. differential
pressure at the Cross-Flow Sensor.
Q
K
4005 x A
K
Inlet
Size
Type
Value Inlet
Size
(inches)
Valve Inlet
Area
(sq. ft.)
K-Factor
(cfm)
Velocity
(fpm)
F-Factor
(amp.)
4
SQUARE
OR
RECT.
3.4 x 3.4
0.080
197
2468
2.98
5
4.3 x 4.3
0.128
316
2468
2.81
6
5.5 x 5.5
0.210
527
2509
2.24
7
5.8 x 6.3
0.254
637
2509
2.24
8
6.7 x 7.2
0.335
933
2786
2.01
9
8.6 x 7.1
0.424
1175
2772
2.05
10
9.5 x 8.0
0.528
1542
2920
1.92
12
13.6 x 8.1
0.765
2234
2920
1.77
14
12.9 x 10.8
0.968
2869
2964
2.03
16
18.3 x 10.8
1.373
3928
2861
2.14
24 x 16
26.1 x 16.3
2.954
8709
2948
1.89
