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A door draught excluder is placed at the bottom of a door to cover the gap located at the threshold. [1] [2] In the Victorian era these draught excluders would be sausage-shaped and made from fabric stuffed with sawdust. [3] Tubular sand-filled fabric draught excluders are commonly referred to as "door snakes" in Australia.
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Black-Draught is also the name of a once-common commercial liquid syrup laxative, sold since the late 19th century, a cathartic medicine composed of a blend of Senna and magnesia. Much like castor oil , it was a commonly used folk remedy for many ailments.
The draft (draught in British English) flow rate induced by the stack effect can be calculated with the equation presented below. [12] [13] The equation applies only to buildings where air is both inside and outside the buildings. For buildings with one or two floors, h is the height of the building and A is the flow area of the openings.
Typically, the queen excluder is either a sheet of perforated metal or plastic or a wire grid in a frame with openings are limited to 0.163 inches (4.1 mm). Queen excluders can also be constructed of hardware cloth screen, of which #5 hardware cloth is often cited in references as sufficient for allowing worker bees to pass, but not queens.
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 ...
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