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.
Confidence votes 42. the purpose of the blockade was to stop the Germans from gaining furthure suppiles of weapons and food. Since all the strong fit man in Germany had gone to war leaving the weak to do everyday work. Germany was a large import/exporter at the start of the war, on a par with Britain. Although Germany imported massive amounts of Wheat before the war, but it's now no longer possible since Russia became enemies of Germany.