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A backdraft (North American English), backdraught (British English) [1] or smoke explosion is the abrupt burning of superheated gases in a fire caused when oxygen rapidly enters a hot, oxygen-depleted environment; for example, when a window or door to an enclosed space is opened or broken. Backdrafts are typically seen as a blast of smoke and ...
The nozzle and flapper mechanism is a displacement type detector which converts mechanical movement into a pressure signal by covering the opening of a nozzle with a flat plate called the flapper. [1] This restricts fluid flow through the nozzle and generates a pressure signal.
Gas leaks can damage or kill plants. [4] [5] In addition to leaks from natural gas pipes, methane and other gases migrating from landfill garbage disposal sites can also cause chlorosis and necrosis in grass, weeds, or trees. [6] In some cases, leaking gas may migrate as far as 100 feet (30 m) from the source of the leak to an affected tree. [7]
If you’re a side-sleeper or if you have trouble sleeping on your back, adding a pillow between your legs and keeping your back straight can still help reduce shortness of breath from chest ...
Last moment of gratitude Earlier today when someone was asking about the 30th anniversary of Friends.It just brings up a lot of gratitude for me that people are still discovering the show and ...
The NFL has fined Cincinnati Bengals running back Chase Brown for his touchdown celebration that saw him jump into a Salvation Army kettle at AT&T Stadium in Dallas on Monday night.. Brown will ...
A dual check backflow preventer is similar to a double check valve in operation. It has two independent spring-loaded check valves. However, dual check valves usually do not include shutoff valves, may or may not be equipped with test cocks or ports, and is generally less reliable than a double check valve.
A flapper is often part of the standard equipment on a fire engine and may also be set up inside and around forests and at heaths in order to take immediate action if a fire is seen. The flapper's technique has been developed from using a wet green pine bough, and wet burlap sacks in the rural south US, to swat the fire known as "wet sacking" a ...