Fig. 39

Grease-X-Tractor™ High Efficiency Filters or Grease Grabber™ Multi-Filtration System

A. Exhaust

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

 

1/2 Width

volume with a rotating vane anemometer as follows:

1/4 Width

1/4 Width

 

1. All cooking equipment should be off. If the hood has internal

 

1/2 Height

short circuit make-up air, it should be turned off.

 

 

2.Measuring Velocities

•Measurement should be taken at six locations per filter.

They must be over the inlet opening as shown in Fig. 39.

• 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. 40. 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 velocity for the filter.

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

5.Calculate each filters volume in CFM by multiplying the average velocity by the conversion factor.

Nominal Filter Size (H x L)

Imperial

Metric

Inches

Millimeters

Conversion Factor

Conversion Factor

16 x 16

400 x 400

1.31 ft2

.122 m2

16 x 20

400 x 500

1.65 ft2

.153 m2

20 x 16

500 x 400

1.23 ft2

.114 m2

20 x 20

500 x 500

1.65 ft2

.153 m2

2 in.

Rotating Vane

Anemometer

Fig. 40

Example: (Imperial)

Hood Length = 7 feet 0 inches with four 20 x 20 filters.

Measure the velocities in fpm for each 20 x 20 filter (six readings per filter)

 

Filter 1

225

201

187

 

 

 

210

238

197

 

 

 

 

 

 

 

Filter 2

228

222

226

 

 

 

237

240

220

 

 

 

 

 

 

 

Filter 3

230

245

240

 

 

 

250

223

219

 

 

 

 

 

 

 

Filter 4

225

265

219

 

 

 

245

221

200

 

 

 

 

 

 

Average slot velocity for Filter 1 =

Sum of Velocity Readings

 

 

 

 

Number of Readings

 

 

 

=

1258

= 209.7 fpm

 

 

 

 

6

 

 

(repeat for each filter)

For a nominal filter size of 20 x 20, the conversion factor is 1.65

Volume for Filter 1 = Conversion Factor

x

Average Velocity

=

1.65 ft2

x

209.7 ft./min.

=

346.0 cfm (repeat for each filter)

Total hood volume

=Filter 1 + Filter 2 + Filter 3 + Filter 4 Volume Volume Volume Volume

=346.0 + 377.6 + 386.9 + 378.1 = 1488.6 cfm

Example: (Metric)

Hood Length = 2.13 meters, with four 500 x 500 mm filters.

Measure the velocities in m/hr for each 500 x 500 mm filter (six readings per filter)

 

Filter 1

4114.80

3675.88

 

3419.86

 

 

3840.48

4352.54

 

3602.74

 

 

 

 

 

 

Filter 2

4169.66

4059.94

 

4133.08

 

 

4334.26

4389.21

 

4023.36

 

 

 

 

 

 

Filter 3

4420.12

4480.56

 

4389.12

 

 

4572.00

4078.22

 

4005.07

 

 

 

 

 

 

Filter 4

4114.80

4846.52

 

4005.07

 

 

4480.56

4041.65

 

3657.60

 

 

 

 

 

Average slot velocity for Filter 1

=

Sum of Velocity Readings

 

 

 

 

 

Number of Readings

 

 

 

 

=

23006

= 3834 m/hr

 

 

 

 

 

6

 

(repeat for each filter)

For a nominal filter size of 500 x 500, the conversion factor is .153

Volume for Filter 1 = Conversion Factor

x

Average Velocity

=

.153 m2

x

3834 m/hr

=

586.7 m3/hr (repeat for each filter)

Total hood volume

=Filter 1 + Filter 2 + Filter 3 + Filter 4 Volume Volume Volume Volume

= 587 + 642 + 657 + 642 = 2528 m3/hr

24 Canopy Hood

®

Page 23 Page 25
Page 24
Image 24
Greenheck Fan 452413 manual Volume with a rotating vane anemometer as follows
Page 23 Page 25

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