Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> Rotary Vent

Rotary Vent
A rotary spinning extractor vent, driven by wind power only, or by electric motor. Usually fixed towards the ridge of a peaked roof.

four rotary roof vents

Four 300mm Dia. (throat or hole size) wind driven rotary roof vents. This type of vent is very cheap simple. They are extremely light weight and just a hint of wind makes them revolve. The action of a breeze spins the vent and the spinning action pulls hot air out of the air space. The fixing of them is fairly simple. A base flashing is provided that should hopefully be tucked under a ridge cap and scribed to the sheeting at the bottom.

The vents come with an adjustable base so that they can be made to sit level on any normal roof pitch. Note! they have to sit level to work correctly.

a powered roof vent

A 400 Dia rotary-vent driven by an electric extractor fan. This one serving a primary school's assembly area.

A different category, heavy and sitting on a purpose made sheet metal base.

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