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  2. Attic fan - Wikipedia

    en.wikipedia.org/wiki/Attic_fan

    An attic fan installed underneath a roof. A powered attic ventilator, or attic fan, is a ventilation fan that regulates the heat level of a building's attic by exhausting hot air. A thermostat is used to automatically turn the fan off and on, while sometimes a manual switch is used. An attic fan can be gable mounted or roof mounted. Additional ...

  3. Rain sensor - Wikipedia

    en.wikipedia.org/wiki/Rain_sensor

    The rain sensor works on the principle of total internal reflection. An infrared light shone at a 45-degree angle on a clear area of the windshield is reflected and is sensed by the sensor inside the car. When it rains, the wet glass causes the light to scatter and a lesser amount of light gets reflected back to the sensor.

  4. Passive ventilation - Wikipedia

    en.wikipedia.org/wiki/Passive_ventilation

    It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces. There are two types of natural ventilation occurring in buildings: wind driven ventilation and buoyancy-driven ventilation. Wind driven ventilation arises from the different pressures created by wind around a building or ...

  5. Drain-waste-vent system - Wikipedia

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

    To allow a single roof penetration as permitted by local building code, sub-vents may be tied together inside the building and exit via a common vent stack, frequently the "main" vent. Adding a vent connection within a long horizontal run with little slope will aid flow, and when used with a cleanout allows for better serviceability.

  6. Rain gutter - Wikipedia

    en.wikipedia.org/wiki/Rain_gutter

    A rain gutter may be a: Roof integral trough along the lower edge of the roof slope which is fashioned from the roof covering and flashing materials. Discrete trough of metal, or other material that is suspended beyond the roof edge and below the projected slope of the roof.

  7. Windcatcher - Wikipedia

    en.wikipedia.org/wiki/Windcatcher

    In the center, a shuksheika (roof lantern vent), used to shade the qa'a below while allowing hot air rise out of it. [ 16 ] The windcatcher can function in two ways: directing airflow using the pressure of wind blowing into the windcatcher, or directing airflow using buoyancy forces from temperature gradients ( stack effect ).

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