Greenheck Fan 452413 manual Volume with a rotating vane anemometer as follows

Page 24
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

®

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Page 23 Page 25
Contents Installation, Operation and Maintenance Manual Table of Contents Table of Contents Receiving and Handling StorageInstallation Hood Installation OverviewFiller Panel Installation Instructions Installing U-Channel Strip Hood Hanging HeightDouble Island Style Hoods Continuous Capture Plenum HoodsElectrical Connections Ductwork ExhaustSupply Installing External Supply Plenums Using the Supply Plenum ClipUsing the Uni-strut Installing the Supply Duct Collar to the Plenum External Supply Plenum Weights, Dimensions, and Supply RatesHanging the Back Supply Plenum Hanging the Hood Air DiffusersInstalling Enclosure Panels Installing End Skirts Installing Backsplash Panels Flat Backsplash PanelHood END Panel Installing Duct Collars Back View of the HoodExhaust Air Balancing Baffles Eabb Checking for BalanceTesting Hood Air Volume Baffle Filter Style Hoods Exhaust Balancing the Kitchen Exhaust SystemRotating Vane Anemometer Supply If Applicable 185 + 187.0 fpm High Velocity Cartridge Filters Exhaust Example282 fpm 423.0 cfm Volume with a rotating vane anemometer as follows 1042 4012 m3/hr Testing Hood Air Volume Short Circuit Hoods Supply Amerex Wiring Plan View PRMAnsul Wiring Plan View EquipmentOverall Wiring Plan View Basic Wiring Diagram Wiring by OthersWiring for Hood Switch Panels Circuit Diagrams OFFMaintenance Daily Maintenance Weekly MaintenancePeriodic Maintenance Condensate Hood Baffle InstallationGrease Grabber Filter Installation Grease Grabber Filter Cleaning Frequent MaintenanceFilter Washing Frequency Guide BestTroubleshooting Problem Cold air can be felt by the cook at the hood Replacement Parts Greenheck Registers Part Number Warranty

452413 specifications

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