TMR-FF
03-24-04
Air Flow Factors
Models: TMR and TMR-AA
Air Flow Measurements:
1.
Place the velometer probe in four equally spaced positions around the inner cone as shown.
2.
Record and average these four velocity readings.
3.
Calculate the flow rate using the following equation.
Flow Rate: CFM = Factor x Average Velocity (FPM)
Note: Select and use the applicable factor from the following table.
E
Alnor 6070, 6000, 2220, or 2220-A
TMR, TMR-AA Air Flow Factors
Nominal Round
Duct Size (inches)
6
8
10
12
14
16
18
20
24
30
36
®
Cones Down
Dimension E
Balancing
(inches)
Factor
1 3/4
0.117
2 1/8
0.201
2 7/8
0.318
3 1/8
0.467
3 3/8
0.626
4
0.813
4 3/4
1.010
5 7/8
1.260
7 3/4
1.840
8 1/8
2.900
10 1/8
3.180
Cones Up
Dimension E
(inches)
1 1/8
1 1/2
2 1/8
2 3/8
2 5/8
3 1/4
3 7/8
4 7/8
6 5/8
6 5/8
8 3/8
Balancing
Factor
0.152
0.266
0.420
0.616
0.832
1.060
1.350
1.680
2.410
3.830
4.150
Note: Refer to the Air Balancing Application Guide for more information about balancing air systems.
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