Lionel,
You can also vent the containers by using a vertical length of black pipe like poly pipe or plastic pipe, from any point in the container (near the base is good). The pipe has to be high enough to get direct sunlight as long as possible each day. Once it heats up each day, and the air inside rises, it causes suction from inside the container. Cheap venting: a few plastic plumbing fittings and some flat black paint. Needs a vent top to prevent rain getting down inside the pipe.
Mike
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