Exhaust-Only Ventilation Exhaust-only ventilation is the reverse of supply-only ventilation; stale air leaves the building from a known location (through exhaust fans ducted to the outdoors) and outdoor air enters the building from an unknown location.
In the 1960s, the Soviet Union began to prepare the Warsaw Pact for its internal function of keeping the NSWP member states within the alliance. The Soviet Union took a series of steps to transform the Warsaw Pact into its intra-alliance intervention force.
The Soviet Union formed this alliance as a counterbalance to the North Atlantic Treaty Organization (NATO), a collective security alliance concluded between the United States, Canada and Western European nations in 1949. Presidential Palace in Warsaw where the Warsaw Pact was signed.