A container designed with openings in the side and/or end walls to permit the ingress of outside air when the doors are closed.<ref>U.S. Department of Transportation Maritime Administration [http://www.marad.dot.gov/publications/glossary/glossary.html]</ref>
+
A container designed with openings in the side and/or end walls to permit the ingress of outside air when the doors are closed.<ref>[http://www.marad.dot.gov/publications/glossary/glossary.html U.S. Department of Transportation Maritime Administration]</ref>