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Bayliss Autovents.

Bayliss Autovents have been produced since 1964 by our family business in Ashbourne, the gateway to the Peak District in Derbyshire. We are proud of the reputation we have for design, quality, reliability and service. We offer a range of autovents that covers almost any automatic ventilation requirement you may have.
An Autovent opens and closes a hinged vent automatically using energy from the warmth of the sun or the surrounding air. The hotter it gets, the wider it opens the vent. A strong metal tube contains a mineral wax which expands with heat. This pushes a piston which opens the vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong stainless steel spring closes the vent and resets the piston.

The Autovent is manufactured using the very best corrosion resistant material including stainless steel, brass and aluminium. Great care is taken to avoid electrolytic corrosion which can occur in the warm and wet conditions in which the Autovents work.


The Autovent units are designed and tested to last for many years. However, each and every part of a Bayliss Autovent can be serviced or replaced should the need arise. Our products are not "throw away" items and as evidence of this, we still carry some spares for the earliest models we made.

Bayliss Autovents have been produced since 1964 by our family business in Ashbourne.We offer a range of autovents that covers almost any automatic ventilation requirement you may have.