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 pact was a temporary alliance of adversaries which secured Hitler's eastern front and bought time for Soviet military preparedness. The agreement was breached by Germany's invasion of the Soviet Union less than 2 years later. The Pact was signed one week before Germany attacked Poland on September 1, 1939.