Location
The venting ports should be positioned at the highest point of the fuel cube tank. This ensures that air can freely enter or exit as the fuel level changes, preventing the formation of a vacuum or excessive pressure. For above - ground tanks, the top center is an ideal location. Additionally, the ports should be away from sources of ignition, such as heaters or electrical equipment, to avoid the risk of fuel vapor ignition.

Size
The size of the venting ports must be carefully calculated. A port that is too small may not allow for sufficient air exchange, leading to pressure imbalances inside the tank. On the other hand, an overly large port increases the risk of fuel vapor leakage. The size should be determined based on factors such as the tank's volume, fuel flow rate, and the expected pressure changes. As a general rule, larger tanks require larger venting ports.

Protection
Venting ports should be equipped with effective protection devices. One common measure is installing flame arrestors, which prevent flames from entering the tank and igniting the fuel vapor. Mesh filters can also be used to block dust, debris, and insects from entering the tank, keeping the fuel clean. In addition, some venting ports may have rain caps to prevent water from entering during rainy weather.

Number
For large - volume fuel cube tanks, multiple venting ports may be necessary. This helps ensure uniform pressure distribution and efficient air exchange. The number of ports should be determined according to the tank's dimensions and the anticipated operational conditions.