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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 .
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 ...
A ridge vent is a type of vent installed at the peak of a sloped roof which allows warm, humid air to escape a building's attic. Ridge vents are most common on shingled residential buildings. Ridge vents are also used in industrial warehouses to help release the hot air and help circulate comfortable air inside the building .
Also, a building with a complex roof or many piercings between the conditioned area and the attic might control condensation better or more cheaply with an insulated roof and a vapor barrier. [ 5 ] One common code requirement is that the total area of attic vents be equal to or greater than 1/150 of the floor area of the attic, with 50 percent ...
The following is a list of bird species endemic or near-endemic to southern Africa (South Africa, Lesotho, Eswatini, Namibia, Botswana, Zimbabwe, and southern Mozambique). [1] Grey-winged francolin, Scleroptila africanus; Orange River francolin, Scleroptila levaillantoides; Red-billed spurfowl (red-billed francolin), Pternistes adspersus
This species is about 12 cm long with rounded wings, strong legs, and a conspicuous ring of white feathers round the eyes. The upperparts are green, and the throat and vent are bright yellow. The members of the Z. v. capensis has a grey breast and belly, whereas Z. v. virens has a greenish-yellow breast and belly.
The northern yellow white-eye (Zosterops senegalensis), formerly the African yellow white-eye, is a species of bird in the family Zosteropidae.It is found across sub-Saharan Africa, from Senegal in the west across to southern Sudan in the east and south to northern Angola.
The swallow breeds in southern Africa from Angola and Zambia southwards to the Cape in South Africa. It is mainly migratory, wintering in Angola, Zambia and southern Zaire. This is a bird of open country and grassland, with a preference for highlands and nearby water. It is often found around man-made structures.