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downdraft, Brit. downdraught

1. A downward current of air in a chimney or flue, often carrying smoke with it.
2. A downward current of air resulting from the passage of air across a window surface, which cools it and increases its density so that it moves downward.
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During the winter, window interior temperatures usually fall below indoor air temperature, causing thermal discomfort due to radiant temperature asymmetry, low operative temperature, and downdraughts.
Larsson, Moshfegh (2002) examined different cases of window installation and came to a conclusion that the window bay width affects the downdraught in two different ways: by deflection of the flow and loss of the momentum.
Table 1 Technology, Energy Sources and Major Products Cluster Technology Raw Materials Energy Sources Rice mills Rubber roller Paddy Electricity sheller Oil mills Oil extractor Groundnut seeds Electricity and sunflower seeds Brick units Intermittent Clay and water Firewood and Downdraught eucalyptus leaves Kiln (IDK) Foundries Cupola Iron pellets and Coke and coal scrap iron Cluster Major Products Rice mills Raw rice/ Boiled rice Oil mills Groundnut oil and Sunflower oil Brick units Bricks Foundries Engine casings, pump body, automobile parts, etc.
To evaluate environmental performance, Cucinella designed a full-scale experimental rig of a downdraught tower and linked office space.
He got them going again just in time but we still had to use the downdraught from our helicopter rotors to blow him away from the cliffs.
A HELICOPTER'S downdraught was used to save a drifting fishing boat from running aground yesterday.
One theory is that storms suck up huge amounts of allergens and then drop them in a huge downdraught.
A Northumbria Police spokeswoman said: ``The police helicopter hovered over the two men and used the downdraught from the rotor blades to blow the men to the bank.
Then, with wicked timing, the downdraught from the blades swishing above sucked the skull-cap from the Pontiff's thinly-haired head.
The roof was blown away by the fierce downdraught from the 16 rotor blades on the helicopters.
It is feared that the downdraught from the chimney of the 50,000-tonne household waste incinerator could bring polluting dioxins on westerly winds which blow over Chester.
But what they did not realise is that the downdraught of rescue helicopters would blow away their last few belongings.