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  2. Vertical draft - Wikipedia

    en.wikipedia.org/wiki/Vertical_draft

    The term "downdraft" can also refer to a type of backdraft which occurs through chimneys which have fireplaces on the lowermost levels (such as basements) of multi-level buildings. It involves cold air coming down the chimney due to low air pressure, and makes it hard to light fires, and can push soot and carbon monoxide into domiciles.

  3. Energy tower (downdraft) - Wikipedia

    en.wikipedia.org/wiki/Energy_tower_(downdraft)

    An energy tower (also known as a downdraft energy tower, because the air flows down the tower) is a tall (1,000 meters) and wide (400 meters) hollow cylinder with a water spray system at the top. Pumps lift the water to the top of the tower and then spray the water inside the tower. Evaporation of water cools the hot, dry air hovering at the top.

  4. Rear flank downdraft - Wikipedia

    en.wikipedia.org/wiki/Rear_flank_downdraft

    The rear flank downdraft can arise owing to negative buoyancy, which can be generated by cold anomalies produced at the rear of the supercell thunderstorm by evaporative cooling of precipitation or hail melting, or injection of dry and cooler air in the cloud, and by vertical perturbation pressure gradients that can arise from vertical gradients of vertical vorticity, stagnation of ...

  5. These 3 Stocks Were Caught in a Downdraft - AOL

    www.aol.com/news/2013-02-28-these-3-stocks-were...

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  6. Downdraft table - Wikipedia

    en.wikipedia.org/wiki/Downdraft_table

    Downdraft tables or downdraught benches are workbenches with built-in ventilation to capture dust, smoke, and fumes and draw them away from the operator and the material being worked on. [1] They typically consist of a perforated surface whose underside is connected to a ventilation or dust collection system, to draw material through the holes ...

  7. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    A chimney cowl or wind directional cap is a helmet-shaped chimney cap that rotates to align with the wind and prevent a downdraft of smoke and wind down the chimney. An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method of regulating draft in situations where prevailing winds or ...

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