This pair of 10 ft x 30 ft shelters were made to fit together in an H pattern, with the main 6 foot entrance tunnel penetrating the bulkhead, and the connecting tunnel stud positioned amidships. It was designed to fit into a very small property while still providing the equivalent space of a 10 ft x 60 ft shelter. A single l0 ft x 30 ft unit can make a nice shelter for a single family. The air handling unit was installed in the sister unit.