3/20 IOM-VAVK (Supercedes 8/12)
INSTALLATION AND OPERATION MANUAL
DIAMOND FLOW SENSOR K-FACTORS
FOR VAV TERMINAL UNITS
Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.
Page 1 of 2
Model Series:
3000 Single Duct
3210 Dual Duct
35S-OAI Series Fan Powered w/ O.A. Damper
38S Underfloor Fan Powered
Model Series:
3100 Single Duct
3230 Dual Duct
3240 "Blendmaster" Dual Duct
33SZ Chilled Water Fan Powered
35N Parallel Fan Powered
35S Series Fan Powered
35S-CVP Pressurization Series Fan Powered
35SST "Stealth
TM
" Series Fan Powered
36VRR Round Retrofit
Model Series:
37N Low Profile Parallel Fan Powered
37S Low Profile Fan Powered
37SST Low Profile "Stealth
TM
" Fan Powered
Model Series:
36VRS Square/Retangular Retrofit
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 Diamond Flow Sensor.
Q
K
4005 x A
K
Inlet
Size
Type
Duct Area
(sq. ft.)
K-Factor
(cfm)
Velocity
(fpm)
F-Factor
(amp.)
4
ROUND
0.087 182 2092 3.67
5
0.136 325 2390 2.81
6
0.196 455 2321 2.98
7
0.267 657 2461 2.65
8
0.349 899 2576 2.42
9
0.442 1158 2620 2.34
10
0.545 1497 2747 2.13
12
0.754 2058 2729 2.15
14
OVAL 0.970 2554 2633 2.31
16
1.186 3035 2559 2.45
24 x 16
RECT. 2.667 6797 2549 2.47
Inlet
Size
Type
Duct Area
(sq. ft.)
K-Factor
(cfm)
Velocity
(fpm)
F-Factor
(amp.)
4
ROUND
0.087 182 2092 3.67
5
0.136 325 2390 2.81
6
0.196 455 2321 2.98
7
0.267 657 2461 2.65
8
0.349 899 2576 2.42
9
0.442 1158 2620 2.34
10
0.545 1497 2747 2.13
12
0.785 2048 2609 2.36
14
1.069 2742 2565 2.44
16
1.395 3683 2640 2.30
18
OVAL 1.683 4323 2569 2.43
Inlet
Size
Type
Damper
(valve)
Size
(inches)
Damper
(valve)
Area
(sq. ft.)
K-Factor
(cfm)
Velocity
(fpm)
F-Factor
(amp.)
7
SQUARE
OR
RECT.
5 x 5 0.174 479 2753 2.12
8
6 x 6 0.250 689 2756 2.11
9
8 x 6 0.333 919 2760 2.11
10
10 x 8 0.555 1531 2759 2.11
11
14 x 8 0.778 2150 2763 2.10
11A
18 x 6 0.750 2068 2757 2.11
12
12 x 10 0.833 2297 2758 2.11
13
18 x 10 1.250 3446 2757 2.11
14
18 x 12 1.500 4135 2757 2.11
15
20 x 14 1.944 5360 2757 2.11
15A
30 x 12 2.500 6892 2757 2.11
16
22 x 16 2.444 6739 2757 2.11
17
24 x 18 3.000 8270 2757 2.11
18
30 x 20 4.167 11486 2756 2.11
19
40 x 20 5.555 15315 2757 2.11
Inlet
Size
Type
Duct Area
(sq. ft.)
K-Factor
(cfm)
Velocity
(fpm)
F-Factor
(amp.)
4
ROUND
0.087 182 2092 3.67
5
0.136 325 2390 2.81
6
0.196 455 2321 2.98
8
0.349 899 2576 2.42
10
0.545 1497 2747 2.13
14 x 8
RECT.
0.777 2035 2619 2.34
14 x 10
0.972 2417 2487 2.59
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