How to choose an axial fan?

Many people who don't know much about cooling fans may be confused when they choose a fan for the first time, including a lack of clear concepts about the air volume, noise and price of bearing fans, so they will have no idea where to start when choosing. So, how can we choose a fan more reasonably?
Step 1: Determine the maximum size and wind pressure First, you need to choose a DC fan of the largest size that you think is suitable for installation and determine the voltage. In this way, you can contact the axial fan supplier to make a test sample to evaluate the effect. If the sample does not meet expectations, you can confirm the relevant parameters by the following methods. Since the fan speed and voltage are proportional, the voltage can be adjusted up by 20% or down by 50%, and then the air volume and noise are tested at each voltage value. Once a voltage value is found so that the test results are within an acceptable range, you can record it and ask the supplier to design a 12V fan according to this voltage value.
How to choose an axial fan? Step 2: Redesign the axial fan Based on the data confirmed by the customer, the supplier will redesign the axial fan. If the first step does not achieve the desired effect, you may need to consider changing the fan size and discuss the new size with the supplier.
Step 3: Choose the right bearing. Choose the right bearing type based on the product warranty period and the use environment. The choice of bearing directly affects the cost of the axial fan. The life of an oil-containing bearing at room temperature is 20,000 hours, while the life of a double ball bearing is 50,000 hours. In a hot and dusty environment, the life of an oil-containing bearing may be shorter than that of a double ball bearing, but the price is relatively lower.

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