The principle of the blowing method is to blow out cold air to dissipate heat from the heat source. Generally speaking, aluminum or copper radiators with fans are designed for blowing air, resulting in higher air pressure and higher efficiency. If it is the air duct on the chassis, direct the cold air to blow directly onto the chip for better heat dissipation. Fans such as CPUs and graphics cards are like this.
The ventilation method is to absorb hot air and extract hot air in a closed space. Typically, suction is used to improve overall airflow, such as exhaust fans in the upper or rear of the casing, just like power fans in a chassis. At the same time, absorbing hot air will increase the temperature of the motor, and generate more heat and be exposed to high temperatures. This type of exhaust heat dissipation will result in a shorter lifespan of the cooling fan compared to the industrial cooling fan used for blowing.
To analyze the specific situation, the key is to form an air duct. When blowing, it is necessary to ensure that the air blowing towards the target is cold air sucked in from the outside, and when sucking, it is necessary to ensure that the hot air sucked in is discharged from the outside of the equipment without being sucked in again by the radiator.
Whether it's the chassis or electronic components, the principle is the same. You can blow and absorb air, and the key is to check whether the air duct design is reasonable. Simply put, it means where cold air comes in and where hot air comes out. Of course, ventilation also requires air flow, which can cause dust deposition. However, because the air flows from various parts to the fan, the concentration of dust is not very large.
