B. Supply (If Applicable):

Example for Perforated Face Supply

1.Hood set up

If the make-up air unit has a temperature control, it should be used to keep the supply air at the desired room discharge air temperature.

2.Measure Velocities

Divide the perforated face panel into a grid of equal areas, each approximately 4 in. (100 mm) square.

Measure the velocity at the center of each grid area. A digital 2.75 in. (70 mm) rotating vane anemometer or equivalent is suggested. The center of the anemometer should be held tight to the face of the panel, and parallel to the filter. Both squareness and distance are important for accuracy. Calculate the average velocity of the panel.

3.Measure the length, height, and width of the perforated face panel.

4.Calculate the perforated face panel volume in CFM by using the following formula:

Volume

=

Avg. Velocity

*

Length (in.)

*

Height (in.)

*

0.005

Volume

=

Avg. Velocity

*

Length (m)

*

Height (m)

*

0.72

5.Calculate the system’s volume by repeating the process for the remaining panels and adding the individual panel volumes together.

Filter Readings (fpm)

260

250

255

260

250

255

265

 

 

 

 

 

 

 

270

275

270

280

265

265

270

 

 

 

 

 

 

 

290

285

280

280

275

290

295

 

 

 

 

 

 

 

285

275

280

260

270

265

260

 

 

 

 

 

 

 

Filter Readings (m/hr)

4755 4572 4663 4755 4572 4663 4846

4938 5029 4938 5121 4846 4846 4938

5304 5212 5121 5121 5029 5304 5395

5212 5029 5121 4755 4938 4846 4755

Example: Face Supply Hood with three 28 in. (.711 m) Perforated Panels

 

 

 

Measured velocities in FPM for one perforated panel

 

 

 

 

 

 

 

Average Velocity

=

Sum of Velocity Readings

 

 

 

 

 

 

 

 

 

Number of Readings

 

 

 

 

 

 

 

(Imperial)

=

260 + 250 + … + 265 + 260

= 270.7 fpm

 

 

 

 

 

 

 

28

 

 

 

 

 

 

 

 

(Metric)

=

4755 + 4572 + … + 4846 + 4755

= 4951 m/hr

 

 

 

 

 

 

 

28

 

 

 

 

 

 

 

 

Measure Length and Height = 28 in. (.711 m) long perforated panels x 16 in. (.406 m) high

Volume for one panel

=

Conversion

x

Average

x

Length

x

Height

 

 

 

 

 

Factor

 

Velocity

 

 

 

 

 

 

 

 

=

0.005

x

270.7 fpm

x

28

x

16

=

 

606.4 cfm

 

=

0.72

x

4951 m/hr

x

.711

x

.406

=

1029 m3/hr

Total system volume

=

(Panel 1 Volume) +

(Panel 2 Volume) +

(Panel 3 Volume)

 

 

 

=

606.4

 

+

614.3

+

 

593.8

 

=

1814.5 cfm

 

=

1029

 

+

1044

+

 

1009

 

=

3082 m3/hr

18 Proximity Hood

®

Page 18
Image 18
Greenheck Fan PN 458294 manual Supply If Applicable, Example for Perforated Face Supply

PN 458294 specifications

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