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  2. Underfloor air distribution - Wikipedia

    en.wikipedia.org/wiki/Underfloor_air_distribution

    UFAD systems use an underfloor supply plenum located between the structural concrete slab and a raised floor system to supply conditioned air to supply outlets (usually floor diffusers), located at or near floor level within the occupied space. Air returns from the room at ceiling level or the maximum allowable height above the occupied zone. [1]

  3. Air-supported structure - Wikipedia

    en.wikipedia.org/wiki/Air-supported_structure

    Air-supported dome used as a sports and recreation venue. An air-supported (or air-inflated) structure is any building that derives its structural integrity from the use of internal pressurized air to inflate a pliable material (i.e. structural fabric) envelope, so that air is the main support of the structure, and where access is via airlocks.

  4. Domed city - Wikipedia

    en.wikipedia.org/wiki/Domed_city

    A domed city is a hypothetical structure that encloses a large urban area under a single roof. In most descriptions, the dome is airtight and pressurized, creating a habitat that can be controlled for air temperature, composition and quality, typically due to an external atmosphere (or lack thereof) that is inimical to habitation for one or more reasons.

  5. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    The vent can also provide air to fill any vacuum created. The key to a functional island fixture vent is that the top elbow must be at least as high as the "flood level" (the peak possible drain water level in the sink), allowing it to serve as a de facto vacuum breaker preventing the loop from becoming a siphon for an overfilled sink, as from ...

  6. Register (air and heating) - Wikipedia

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

    Generally, in rooms where it is critical to maintain a constant temperature two registers (one placed near the ceiling to deliver cold air, and one placed in the floor to deliver hot air) and two returns (one high, one low) will be used. HVAC systems generally have one register and one return per room. [4]

  7. 24 Discontinued '70s and '80s Foods That We'll Never ... - AOL

    www.aol.com/finance/24-discontinued-70s-80s...

    3. Keebler Fudge Magic Middles. Neither the chocolate fudge cream inside a shortbread cookie nor versions with peanut butter or chocolate chip crusts survived.

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