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. 35.

•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. 31. 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. 35

2 in.

Rotation Vane

Anemometer

Fig. 36

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.

Average slot velocity

=

Sum of Velocity Readings

 

 

Number of Readings

(Imperial)

=

5330

=

444.2 fpm

12

 

 

 

 

 

 

(Metric)

=

97474

=

8123 m/hr

12

 

 

 

 

 

 

CFM per linear foot

=

Average Slot Velocity

 

 

Conversion Factor

 

=

444.2 fpm

=

206.6 cfm/linear foot

 

2.15

 

 

 

 

 

 

 

 

 

=

8123 m/hr

=

1152 m3/hr

 

7.05

 

 

 

 

 

 

 

 

Filter Readings (fpm)

470

440

425

 

 

 

482

430

453

 

 

 

455

431

441

 

 

 

399

439

465

 

 

 

Filter Readings (m/hr)

 

 

 

8595

8047

7772

 

 

 

8815

7864

8284

 

 

 

8321

7882

8065

 

 

 

7297

8028

8504

 

 

 

Hood exhaust volume =

CFM/linear foot (m3/hr / m)

x

Hood Length

 

 

=

206.6

x

9 ft.

=

1859.4 cfm

=

1152

x

2.74 m

=

3156 m3/hr

 

 

 

 

 

 

22

Canopy Hood

 

 

 

 

®

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Greenheck Fan 452413 manual High Velocity Cartridge Filters Exhaust, Example
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