Budget "clip-on" model lifting a load of up to 5.5kg (12lbs) giving a maximum opening of approximately 12". The unit measures 11" in length and is supplied in satin anodised finish.

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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.

What does a Bayliss Autovent do?

It 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.

How does it work?

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.

What is the Bayliss Autovent made from?

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.

How long will it last?

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.

Is it difficult to fit?

No. Comprehensive illustrated fitting instructions are included with every Autovent, together with a pack containing the necessary fixing screws.

Is it guaranteed?

All our products are guaranteed for two years. Provided the unit has not been tampered with or damaged, we will repair it free of charge if it is returned to us within the guarantee period.

Why is the Bayliss Autovent better?

It has been designed by engineers who have been making automatic vent controls for over 30 years, and incorporates all the knowledge and experience gained during this time. All Bayliss Autovents have a strong stainless steel spring to give a firm closing force, and this virtually eliminates any risk from wind damage.
The unit gives a balanced lifting action in the middle of the vent and this avoids any sideways thrust on the vent which can twist it or even push it out of position.