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The national flag of the United States, often referred to as the American flag or the U.S. flag, consists of thirteen horizontal stripes, alternating red and white, with a blue rectangle in the canton bearing fifty small, white, five-pointed stars arranged in nine offset horizontal rows, where rows of six stars alternate with rows of five stars.
See also: Flags of the U.S. states and territories A 2.00 m × 1.70 m oil painting showing historical US flags. This is a list of flags in the United States describing the evolution of the flag of the United States, as well as other flags used within the United States, such as the flags of governmental agencies. There are also separate flags for embassies and ships. National flags Main article ...
The infiltration rate is the volumetric flow rate of outside air into a building, typically in cubic feet per minute (CFM) or liters per second (LPS). The air exchange rate, (I), is the number of interior volume air changes that occur per hour, and has units of 1/h.
More than 100 pages use this file. The following list shows the first 100 pages that use this file only. A full list is available.. 1868 United States presidential election
National flags are adopted by governments to strengthen national bonds and legitimate formal authority. Such flags may contain symbolic elements of their peoples, militaries, territories, rulers, and dynasties. The flag of Denmark is the oldest flag still in current use as it has been recognized as a national symbol since the 14th century.
Use: National flag : Proportion: 2:3: Adopted: March 4, 1865: Design: A white rectangle, one-and-a-half times as wide as it is tall, a red vertical stripe on the far right of the rectangle, a red quadrilateral in the canton, inside the canton is a blue saltire with white outlining, with thirteen white five-pointed stars of equal size inside the saltire.
Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...
HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...