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.
What the North Atlantic Treaty Organization (NATO) is for the Western democracies, the Warsaw Pact was for the Soviet Union and Eastern Europe. The full title is Warsaw Treaty of Friendship, Cooperation, and Mutual Assistance. The treaty was signed on May 14, 1955, by the Soviet Union, Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, and Romania. (Albania withdrew in 1968. East Germany withdrew in 1990.) The treaty was renewed for 10 years in 1975 and for 20 more in 1985.