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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.

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. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   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 .

5. Components of jet engines - Wikipedia

   en.wikipedia.org/wiki/Components_of_jet_engines

   Shaft — The shaft connects the turbine to the compressor, and runs most of the length of the engine. There may be as many as three concentric shafts, rotating at independent speeds, with as many sets of turbines and compressors. Cooling air for the turbines may flow through the shaft from the compressor.

6. Surface condenser - Wikipedia

   en.wikipedia.org/wiki/Surface_condenser

   This "derating" of the turbine to accommodate the condenser's fouled or blocked tubing is an indication that the plant needs to clean the tubing in order to return to the turbine's nameplate capacity. A variety of methods for cleaning are available, including online and offline options, depending on the plant's site-specific conditions.

7. 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.