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  2. Lev door - Wikipedia

    en.wikipedia.org/wiki/Lev_door

    In cold climate, Lev doors enable effective convection of warm air through buildings from central heat sources, such as fireplaces or air conditioning units, without the need for ducting. In warm climate, the doors enable free passage of cooling cross-breezes when the main door leaf is shut.

  3. Register (air and heating) - Wikipedia

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

    Ideally, a room will have both heating and cooling registers. In practice, cost considerations usually require that heating and cooling be provided by the same register. In such cases, heating most often takes precedence over cooling, and registers are usually found close to the floor. [7] For heating purposes, a floor register is preferred.

  4. Revolving door - Wikipedia

    en.wikipedia.org/wiki/Revolving_door

    A revolving door in Turkey (counter-clockwise rotation) A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. To use a revolving door, a person enters the enclosure between two of the doors and then moves continuously to the desired exit while ...

  5. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...

  6. Glossary of HVAC terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_HVAC_terms

    The study of the behavior of air-water vapor mixtures. Water vapor plays an important role in energy transfer and human comfort in HVAC design. rooftop unit (RTU) A packaged unit that controls both heating and air conditioning. An air handler typically refers to a unit that provides a fan to support either heating or cooling. radiant ceiling panels

  7. Door hanger - Wikipedia

    en.wikipedia.org/wiki/Door_hanger

    Door Hangers are also used in competition with direct mail as an advertising vehicle. Most recently, companies providing this type of advertising have been using the term Direct to Door Advertising. This type of advertising offers a number of advantages over traditional direct mail in that the impression is "guaranteed".

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