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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. Passive ventilation - Wikipedia

    en.wikipedia.org/wiki/Passive_ventilation

    A roof turbine ventilator, colloquially known as a 'Whirly Bird' is an application of wind driven ventilation. Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems.

  4. Windmill at Ruprechtov - Wikipedia

    en.wikipedia.org/wiki/Windmill_at_Ruprechtov

    The turbine is now rotating at a height of 16 m above the ground, its diameter is 10 m and it weighs about 2 tons. The mill still has the original mill machines. Even though grinding stopped in the 1960s the roof turbine is still in operation. [3] The mill was completely restored in 1998 and is open to the public.

  5. Wind turbine - Wikipedia

    en.wikipedia.org/wiki/Wind_turbine

    When a turbine is mounted on a rooftop the building generally redirects wind over the roof and this can double the wind speed at the turbine. If the height of a rooftop mounted turbine tower is approximately 50% of the building height it is near the optimum for maximum wind energy and minimum wind turbulence.

  6. Small wind turbine - Wikipedia

    en.wikipedia.org/wiki/Small_wind_turbine

    Turbine blades for small-scale wind turbines are typically 1.5 to 3.5 metres (4 ft 11 in – 11 ft 6 in) in diameter and produce 0.5-10 kW at their optimal wind speed. [1] Most small wind turbines are horizontal-axis wind turbines , [ 2 ] but vertical axis wind turbines (VAWTs) may have benefits in maintenance and placement, although they are ...

  7. Attic - Wikipedia

    en.wikipedia.org/wiki/Attic

    Attic bedroom in Skógar, Iceland The Poor Poet, by Carl Spitzweg, 1839 (Neue Pinakothek) Attic in Berlin, Germany. An attic (sometimes referred to as a loft) is a space found directly below the pitched roof of a house or other building.