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.
watch this video on the App. Thousands of miles of trenches were built during World War I and, for the soldiers living in them, their day-to-day life was nothing short of horrific.New to Old.housands of miles of trenches were built during World War I and, for the soldiers living in them, their day-to-day life was nothing short of horrific. New to Old.