Vents are a must-have for any container, use these vents to replace the manufacture vents on a shipping container. Adding vents to your shipping container will help prevent moisture build-up, eliminate dangerous fumes and chemicals that can lead to fire or explosion, and allow optimal airflow. You should vent your container anytime you are storing household items, heavy machinery and automobiles, dry goods, and chemicals/pressurized gasses. It is recommended for each container to have two to six vents, depending on the length of the container.