Selecting a Fan

Local Sales Support | Global Support | Contact Us

Order Literature | Catalog PDF

Selecting a Fan

ORIENTAL MOTOR offers Technical Support for all of our products. ORIENTAL MOTOR's technical support team is qualified to answer a wide variety of questions. Call toll free 1-800-GO-VEXTA (468-3982) to speak with an ORIENTAL MOTOR associate, or e-mail techsupport@orientalmotor.com.

Our Motor Sizing / Product Recommendation Sheets are now available online. ORIENTAL MOTOR's Application Engineers and Technical Support Staff are available to assist you in properly sizing and selecting your motor based on your individual application. Simply call 1-800-GO-VEXTA (468-3982) or complete an online Product Recommendation Request form and one of our knowledgeable staff will assist you.

Measurement Conversion Charts

Selecting a Fan
Basic methods for selecting typical ventilation and cooling products based on their use.

1. Device specifications and conditions- Determine what the internal temperature the device should be.

2. Heat generation within the device- Determine the amount of heat generated internally by the device.

3. Calculate required air volume- Once you have determined the amount of heat generated, the number of degrees the temperature is to be lowered and what the ambient temperature should be, calculate the air volume required.

4. Selecting a Fan- Select a fan using the required air flow. The air flow of a mounted fan can be found from the fan's air-flow vs. static-pressure characteristics and pressure loss of the object to be cooled, as shown in Fig 1. It is difficult to calculate the device's pressure loss, so an estimation for maximum air flow of 1.3 to 2 times the required air flow may be used.

Fan Selection Flowchart

Example Selection

In this example, an appropriate cooling fan is selected to cool a DC power supply inside a cabinet. The fan's power comes directly from an AC power supply, so select an AC fan.

1. Heat Generated Within Device

2. Calculate the Required Air Flow

3. Select a Fan

Select a fan with a maximum airflow twice that of the required air flow found in step 2. The MU825S-23 has a maximum air flow of 15.9 (CFM), which is larger than 3.6 x 2 = 7.2 (CFM).

4. Check the Temperature Within the Device

Check the temperature within the device when the MU825S-23 is used. If the ventilated air flow is half the fan's maximum air flow, or 7.95 (CFM), then