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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. Whole-house fan - Wikipedia

   en.wikipedia.org/wiki/Whole-house_fan

   The fan removes hot air from the building and draws in cooler outdoor air through windows and other openings. While sometimes referred to as an "attic fan", it is not to be confused with a powered attic ventilator , which exhausts hot air from the attic to the outside through an opening in the roof or gable at a low velocity.

4. Attic - Wikipedia

   en.wikipedia.org/wiki/Attic

   Louvered attic vent in a gable Modern building codes permit both vented and unvented attics in all climates, if a building is otherwise correctly constructed. [ 5 ] However, unoccupied attics should usually be ventilated [ 6 ] to reduce the accumulation of heat and moisture that contribute to mold growth and decay of wood rafters and ceiling ...

5. Mechanical floor - Wikipedia

   en.wikipedia.org/wiki/Mechanical_floor

   In this case, the ventilation systems of the mechanical floor are seen as gable vents, dormers, or abat-sons (louvers in a bell tower). Examples include some buildings in UCLA, like Dodd Hall, which has a mechanical floor disguised as an attic and a bell tower.

6. Ventilation (architecture) - Wikipedia

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

   Mechanical ventilation systems may include supply fans (which push outdoor air into a building), exhaust [3] fans (which draw air out of a building and thereby cause equal ventilation flow into a building), or a combination of both (called balanced ventilation if it neither pressurizes nor depressurizes the inside air, [3] or only slightly ...

7. Dormer - Wikipedia

   en.wikipedia.org/wiki/Dormer

   Dormer window of the Building of Préfecture de police de Paris (île de la Cité) Gable dormers at Hospices de Beaune in Beaune, France Pair of hip roof dormer windows on the Howard Memorial Hall, Letchworth. A dormer is a roofed structure, often containing a window, that projects vertically beyond the plane of a pitched roof. [1]