All design engineers of motors and electronic products that need to use fans to dissipate heat must determine the air volume required for a specific system to dissipate heat. The air volume required for a Cross flow blower depends on understanding the power consumption of the system and whether it can take away enough heat. To prevent the system from overheating. Facts show that the service life of the system will be reduced due to the insufficiency of the cooling system. Therefore, the design engineer should also understand that the sales volume and price of the system may decrease because the service life of the system does not meet the expectations of users.

To choose the right Cross flow blower, the following goals must be considered:
1. The best air flow efficiency
2. The smallest suitable size
3. Minimal noise
4. Minimal power consumption
5. Maximum reliability and service life
6. Reasonable total cost
Choosing Cross flow blower through the following steps can help you achieve the above goals.
 
The first is to know the total cooling demand. To understand the total cooling demand, there are the following three points
1. The heat that must be converted (ie temperature difference DT)
2. The wattage to offset the conversion heat (W)
3. Air volume (CFM) required to remove heat
The total cooling requirement is very important for the effective operation of the system. Efficient Cross flow blower system operation must provide ideal operating conditions, so that all components in the system can perform the maximum function and the longest service life.

Secondly, through the understanding of the total cooling demand, the following method is used to obtain the air volume required by the Cross flow blower equipment.
1. Calculate the heat generated inside the Cross flow blower equipment.
2. Determine the allowable temperature rise range inside the equipment.
3. Calculate the required air volume from the equation.