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2. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   During winter months, for example, an air conditioning register can be closed to prevent cold air from being pulled from the room. This allows the hot air to mix more completely with the cold air in the room, improving the efficiency of the HVAC system. [7] (The return should be efficient enough to draw off the cooler air.) [10] [11]

3. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   It is commonly sold as boxes containing 25' (7.5 m) of duct compressed into a 5' (1.5 m) length. It is available in diameters ranging from as small as 4" (10 cm) to as big as 18" (45 cm), but the most commonly used are even sizes ranging from 6" to 12" (15 to 30 cm).

4. Dorade box - Wikipedia

   en.wikipedia.org/wiki/Dorade_box

   Dorade boxes operate on the principle that air can pass relatively freely through the chambers, yet rain or sea wash will be trapped in successive chambers and drain out of the small holes in the sides of the box. The principle can be applied to other forms. For example, one variant has a circular layout with the baffles as concentric rings.

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6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

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7. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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