High Velocity Cartridge Filters

A. Exhaust

With all the filters in place, determine the total hood exhaust

1/4 Width

volume with a rotating vane anemometer as follows:

 

1.All cooking equipment should be on. If the hood has internal short circuit make-up air, it should be turned off.

2.Measuring Velocities

•Velocity measurement should be taken at three locations per filter. These must be over the inlet opening as shown in Fig. 27.

•Measure the velocity of each location. A digital 2.75 in. (70 mm) rotating vane anemometer or its equivalent is suggested. The center of the anemometer should be held 2 in. (50 mm) from the face of the filters as in Fig. 28. It is helpful to make brackets to keep the anemometer at the 2 in. (50 mm) distance and parallel to the filter. Both squareness and distance are important for accuracy.

3.Calculate the average slot velocity.

4.Calculate the CFM per linear foot by dividing the average velocity by a conversion factor listed in the following table.

5.Calculate the hood’s exhaust volume by multiplying the CFM per linear foot by the length of hood.

1/2 Width

1/4 Width

Fig. 27

2 in.

Rotating Vane

Anemometer

Fig. 28

 

Cartridge Filter Size

 

 

 

Imperial

 

Metric

 

 

 

 

Conversion Factor

Conversion Factor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16 in. (400 mm) high with 4 in. (100 mm) high inlet

 

1.63

1/ft3

 

5.35

1/m3

 

 

20 in. (500 mm) high with 4 in. (100 mm) high inlet

 

2.15

1/ft3

 

7.05

1/m3

 

 

16 in. (400 mm) high with 7 in. (120 mm) high inlet

 

1.24

1/ft3

 

4.07

1/m3

 

 

20 in. (500 mm) high with 7 in. (120 mm) high inlet

 

1.58

1/ft3

 

5.18

1/m3

 

Example:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measure the slot velocities in fpm for a 9 ft. (2.74 m) hood with four 20 x 20 in. (500 x 500 mm)

 

filters with standard opening, three readings per filter.

 

 

 

 

 

 

 

 

 

 

 

 

Filter Readings (fpm)

 

 

 

Sum of Velocity Readings

 

 

 

Average slot velocity

=

 

 

 

 

 

 

 

 

 

 

 

 

470

 

 

440

 

425

 

 

 

Number of Readings

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

482

 

 

430

 

453

 

 

 

5330

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Imperial)

=

= 444.2 fpm

 

 

 

455

 

 

431

 

441

 

12

 

 

 

399

 

 

439

 

465

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

97474

 

 

 

 

 

 

 

 

 

 

 

=

 

 

 

 

 

 

 

 

 

 

(Metric)

= 8123 m/hr

 

 

 

Filter Readings (m/hr)

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8595

 

 

8047

 

7772

 

 

 

Average Slot Velocity

 

 

 

 

 

 

 

 

 

CFM per linear foot

=

 

 

 

8815

 

 

7864

 

8284

 

 

 

 

 

 

 

 

 

 

 

 

8321

 

 

7882

 

8065

 

 

 

Conversion Factor

 

 

 

 

 

 

 

 

=

444.2 fpm

= 206.6 cfm/linear foot

 

7297

 

 

8028

 

8504

 

 

2.15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

=

8123 m/hr

= 1152 m3/hr

 

 

 

 

 

 

 

 

 

 

 

7.05

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hood exhaust volume

=

CFM/linear foot (or m3/hr / m)

x Hood Length

 

 

 

 

 

 

 

=

 

 

206.6

 

x

9 ft.

=

1859.4 cfm

 

 

 

=

 

 

1152

 

x

2.74 m

=

3156 m3/hr

 

20 Proximity Hood

®

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Greenheck Fan PN 458294 manual High Velocity Cartridge Filters Exhaust, Example
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PN 458294 specifications

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