 Each of the modules that formed the outer walls of the building was fitted with a prefabricated set of louvres that could be opened and closed using a gear mechanism, allowing hot stale air to escape.The flooring consisted of boards wide, which were spaced about apart; together with the louvres, this formed an effective passive air-conditioning system.Because of the pressure differential, the hot air escaping from the louvres generated a constant airflow that drew cooler air up through the gaps in the floor.