Table 36 Rooftop Ventilator Capacities

Airflow volumes are in cfm RIDGE VENTILATORS w/ 4 IN x 10-0" OPENING

PREVAILING ^-A temperature between indoors & outdoors

4 mph

205

270

330

3ô0

425

470

510

6 mph

470

340

415

4ô0

540

595

640

ô mph

. 315

415

500

5ô0

655

720

775

10 mph

370

4ô5

590

6ô0

770

ô45

910

12 mph

. 425

560

675

7ô0

ôô0

970

1,050

GLOBE AND CIRCULAR VENTILATORS 1

PREVAILING

--

- A temperature between indoors & outdoors

--

WINDSPEED

00

50

100

150

200

250

300

4 mph

100

110

120

130

140

155

170

6 mph

125

135

150

165

1ô0

195

215

ô mph

150

165

1ô0

200

220

240

260

10 mph

175

195

215

235

255

2ô0

305

12 mph

200

220

245

270

295

320

350

1. For 8 in. dia. turbine ventilators, multiply above airflow volumes x 1.00. For 12 in. dia. turbine ventilators, multiply above airflow volumes x 2.27. For 12 in. dia. circular ventilators, multiply above airflow volumes x 1.94.

1. For 8 in. dia. turbine ventilators, multiply above airflow volumes x 1.00. For 12 in. dia. turbine ventilators, multiply above airflow volumes x 2.27. For 12 in. dia. circular ventilators, multiply above airflow volumes x 1.94.

• The author regrets that he has lost the source for the rooftop ventilators in

REVOLVING VANED TURBINE

EXTERNAL BRACE

EXTERNAL BRACE

DAMPER w/ PULL CHAIN

Also a globe ventilator, this is a short vertical duct with a vaned turbine on top. When prevailing winds make the turbine rotate, it sucks air from below.

DAMPER w/ PULL CHAIN

Also a globe ventilator, this is a short vertical duct with a vaned turbine on top. When prevailing winds make the turbine rotate, it sucks air from below.

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