Example - for a 3-bedroom, 2,000-sq.ft. home, with an exhaust-only ventilation strategy, and a target ventilation rate of 50 CFM you would need to install a 50 CFM fan with an adjustable-speed DC motor for continuous operation.
Quick Answer. Trenches were built during World War I to protect stalemated troops on both sides from artillery and rifle fire. Although the war began with rapid movement of the German army, when the Allied forces stopped the Germans, both sides dug trenches to help avoid losing territory they had gained.
The Purpose of Cyberwarfare The main purpose of cyberwarfare is to gain advantage over adversaries, whether they are nations or competitors. A nation can continuously invade other nationâs infrastructure, steal defense secrets, and gather information about technology to narrow the gaps in its industries and military.