Station 825 on Engebi, and Station 826 on Muzin, had ventilating systems designed to maintain a maximum temperature of 120°F for a period of 30 seconds after the system closed. Solenoid~operated butterfly valves were required on the supply and exhaust openings on these stations. Station 827 on Teiteiripucchi, and Station 828 on Bokonaarappu, had ventilating systems similar to those described above, except that butterfly valves were not used because the stations were constructed of wood and were at considerable distance from zero, The exhaust fans for these four stations were rubber coated because of the more concentrated sulphuric acid vapors passing through them, For Station 75 on Engebi, Station 76 on Bogallua, Stations 77 and 78 on Kirinian, and Station 79 on Bokonaarappu, two identical supply systems were designed so that in the event of one fan failure the other fan would still supply the station with ventilation, The fans were to continue to run several hours after the experiment and were to operate from storage batteries. Design requirements were such that the systems had to be provided with a very high velocity air stream, The duct work was designed to be constructed of prefabricated welded light wall steel pipe assemblies, The working drawing was completed March 24, 1950; however in April, J-Division advised that the User would supply and install all interior ventilation and that this feature was to be omitted on the H & N drawing. The CMR area on Parry was provided with a conventional ventilating system consisting of a large supply of fans and aluminum sheet metal duct work outside supply air to the roof exhaust fans of equipment. In of each of the two large various locations within were provided over hoods addition, one section of buildings. These were to the building, Motor driven that served the major pieces the laboratory space was provided with dehumidification equipment to provide protection for instrumentation and laboratory equipment. 5-262