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2. 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 .

3. 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. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan. Factors which determine the performance of the fan include the ...

4. 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.

5. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.

6. Sealegend Dryer Vent Cleaner Kit sale - AOL

   www.aol.com/lifestyle/sealegend-dryer-vent...

   Save 45% now — and money and energy later — with this bestselling dryer vent–cleaning kit at Amazon. ... Shop the best New Year's Amazon deals for big savings on Apple, Ninja, Keurig and more.

7. Drain-waste-vent system - Wikipedia

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

   Under many older building codes, a vent stack (a pipe leading to the main roof vent) is required to be within approx. a 5-foot (1.5 m) radius of the draining fixture it serves (sink, toilet, shower stall, etc.). [2] To allow a single roof penetration as permitted by local building code, sub-vents may be tied together inside the building and ...