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.
Officially, the Truman Doctrine focused on economic assistance to the needy populations of the struggling nations; unofficially, the real purpose of the Truman Doctrine was to fund anti-Communist forces and virtually any related effort to undermine Soviet attempts to spread Communism anywhere in the world.