Measure the velocity of each location.

A digital 2.75 in. (70 mm) rotating

 

 

 

 

 

 

 

 

Rotating Vane Anemometer

vane anemometer or equivalent

 

is suggested. The center of the

Airflow

 

 

 

 

 

 

anemometer should be held 2 in.

 

 

 

 

 

 

 

 

 

 

 

 

 

(50 mm) from the face of the filters as

 

2 in.

 

 

 

 

 

 

 

 

 

 

 

shown in Fig. 30. It is helpful to make

 

 

 

 

 

 

 

 

 

 

 

 

a bracket to keep the anemometer

 

 

 

 

 

 

 

at the 2 in. (50 mm) distance and

 

 

 

 

 

 

 

parallel to the filter. Both squareness

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 30

and distance are very important for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

accuracy.

 

 

 

 

 

 

 

Calculate the average velocity for the filter.

3.Determine the filter’s conversion factor from the table.

4.Calculate the filter’s volume in CFM (m3/hr) by multiplying the average velocity by the conversion factor.

5.Calculate the hood’s volume by repeating the process for the remaining filters and summing the individual filter volumes.

Nominal Filter Size (H x L)

Imperial

Metric

Inches

Millimeters

Conversion Factor

Conversion Factor

 

 

 

 

16 x 16

400 x 400

1.63

.157

16 x 20

500 x 400

2.13

.198

20 x 16

400 x 500

1.90

.177

20 x 20

500 x 500

2.48

.230

Example: Exhaust Only Hood with three 20 x 16 Filters

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measured velocities in fpm for one 20 x 16 Filter

 

 

 

 

 

 

 

255

 

 

 

 

 

250

 

 

 

 

 

 

 

 

 

(4663.44 m/h)

 

 

 

 

(4572 m/h)

 

 

 

 

 

 

Sum of Velocity Readings

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Average Velocity

=

 

 

 

 

 

 

 

 

 

 

256

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(4681.73 m/h)

 

 

 

 

 

 

 

 

 

Number of Readings

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

248

 

 

 

 

240

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

255 + 250 + 256 + 248 + 240 = 249.8 fpm

 

 

 

 

(4535.42 m/h)

 

 

 

(4389.12 m/h)

 

 

 

 

(Imperial)

=

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Metric)

=

4663 + 4572 + 4681 + 4535 + 4389

= 4568 m/hr

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For a nominal filter size of 20 x 16, the conversion factor is 1.90 Imperial (.177 Metric)

 

 

 

 

 

 

 

 

 

Volume for one filter

=

Conversion Factor

x

Average Velocity

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

=

1.90

 

x

249.8 fpm

=

 

 

474.6 cfm

 

 

 

 

 

 

 

 

 

 

=

.177

 

x

4568 m/hr

=

 

 

809 m3/hr

 

 

 

 

 

 

 

 

 

Total hood volume

=

(Filter 1 Volume)

+

(Filter 2 Volume)

+

(Filter 3 Volume)

 

 

 

 

 

 

 

 

 

 

 

 

=

474.6

+

 

455.4

+

470.1

 

 

 

=

1400.1 cfm

 

=

809

+

 

880

+

799

 

 

 

 

=

2488 m3/hr

19 Canopy Hood

®

Page 19
Image 19
Greenheck Fan 452413 manual Rotating Vane Anemometer

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