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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. Fan (machine) - Wikipedia

    en.wikipedia.org/wiki/Fan_(machine)

    They are used on the floor, table, desk, or hung from the ceiling (ceiling fan) and can be built into a window, wall, roof, etc. Tower fans tend to have smaller blades inside. Electronic systems generating significant heat, such as computers, incorporate fans. Appliances such as hair dryers and space heaters also use fans.

  4. Ventilation (architecture) - Wikipedia

    en.wikipedia.org/wiki/Ventilation_(architecture)

    The furnace, built on the outside of the workshop, featured earthen pipe-like air vents with hundreds of tiny holes in them and a prototype chimney to ensure air goes into the furnace to feed the fire and smoke comes out safely. [39] Passive ventilation and passive cooling systems were widely written about around the Mediterranean by Classical ...

  5. Ventilation (firefighting) - Wikipedia

    en.wikipedia.org/wiki/Ventilation_(firefighting)

    Mechanical fans can be used to provide positive pressure ventilation by breaking or removing windows, skylights or heat/smoke vents on the roof; or by cutting new exhaust vents in the building. If there is no suitable existing hole, firefighters may use their equipment to make one, such as specialized saws for cutting a large hole in the roof.

  6. Axial fan design - Wikipedia

    en.wikipedia.org/wiki/Axial_fan_design

    An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit.

  7. Duct (flow) - Wikipedia

    en.wikipedia.org/wiki/Duct_(flow)

    Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

  8. Domestic roof construction - Wikipedia

    en.wikipedia.org/wiki/Domestic_roof_construction

    This is why UK Building Regulations require roofs to be ventilated, either by the use of soffit vents, ridge vents, or replacement ventilation slates or tiles. [7] A common method of ventilating a roof is to make openings in the soffit and ridge to allow natural air flow. This example also has ventilated exterior walls called rainscreen ...

  9. Kitchen hood - Wikipedia

    en.wikipedia.org/wiki/Kitchen_hood

    Although many vent hoods exhaust air to the outside, some recirculate the air to the kitchen. In a recirculating system, filters may be used to remove odors in addition to the grease. The device is known as an extractor hood in the United Kingdom , as a range hood in the United States , and as a rangehood in Australia .