Container ventilation, without proper ventilation of your container you damage your stored goods. You can also get heat or moisture build up. If any moisture reaches your items and is sealed inside your container without any air circulation, your items can warp, mold, and mildew. Because our vents have to be small, it keeps the water out.
If you are needing to block this ventilation, you can put reticulated foam or something similar to block it.
For a list of all our products visit our website at www.weststeel.com. Or call us at 888-335-4507.