The Whirlybird Roof Vents Guide


The roof acts as a screen that prevents the heat from escaping from the ceiling cavity and allowing it to circulate and accumulate in the interior of the house. This becomes a major issue especially during the hot and sunny days when the in-house temperature gets to its peak. At times the heat gets up to 70 degrees making it hard for you to remain indoors.

When the temperature goes up to high levels, the air conditioners will need to work harder to deal with the heat. This leads to a rising pressure on the utility bills. This, therefore, means that you need an efficient solar powered whirlybird roof ventilator. The work of roof ventilators is to assist in managing the roof space temperature during summer ensuring the comfort of those living in that building. They also work as a shield to the ceiling as they protect it from corrosion resulting from moisture build up during winter.

Of the most commonly used roof ventilators, whirlybird is the most mentioned. This type of ventilators has been on the market for decades and happens to be among the first air driven roof vents to be in the market.  There is, however, a need to understand what they are and how they operate.

Whirlybirds are sometimes referred to as whirligigs, and they are a kind of roof vent installers that removes accumulated heat in the roof space by convection currents.  There are two types of whirlybird roof ventilators: passive wind-driven whirlybirds, and active, powered whirlybirds. The only difference is that the active powered whirlybird is that they are electrically powered, while the wind-driven whirlybird is operated by the wind and expanding air resulting from rising temperature in the roof space. The most preferred one is the wind-driven whirlybird as it is inexpensive.

In most cases, whirlybirds are made up of aluminum exterior or galvanized steel. The vent of whirlybirds has a fluted head that is set by use of ball bearings, which allow the vent to spin. The whirlybird is also referred to as a turbine vent because of its external appearance that that resembles a turbine.

The mechanics behind the effectiveness of a whirlybird is simple. The metal top of this ventilator consists of specially engineered fins that scoop the wind.  When the wind blows through the turbines, the ventilator rotates causing a vacuum effect that sucks hot air from the inside of the house.  The heat that is in the roof space is drawn upwards and gets into the whirlybird, which then expels it through its vents.

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