We have 3 on the property. 2 at 40', 1 at 20' feet to store my excess and miscellanious. I have loaded 100s with food products for shipment.
I have yet to see one without ventilation in the top corners.
But still, I would not wish to be locked in one. Probably would hit 120 degrees in the summer sun.
I prefer to buy used refrigerator containers, they have zero vents, steel floors and come insulated with closed cell foam between the steel inner and outer walls, floor and ceiling.
To each his own..
