Superior Automatic Vent Openers Mfged. by Bayliss Autovents

Superior Autovents

Since 1982

Uses no electricity

This vent opener uses a very simple principal - Special waxes have an expansion rate of about 18% when heated by the sun. As the air in the greenhouse heats up it also heats the powertube in the ventopener. As the wax expands it pushes out a stainless steel piston that slowly opens the vent up to 13 inches. The hotter the temperature the wider the opening. When the temperature cools the weight of the vent and a 6 1/2 pound stainless steel spring closes the vent and helps holds it closed. This allows the opener to be installed on the roof or a side wall.

The Superior Mk 7 S (pictured) <> Adjustable beginning to open temperature range 60 - 75 degrees <> Can lift hinged vents weighing up to 30 pounds <> Wide opening up to 13 inches. Works on roof or side wall vents. <> Built in 6 1/2 pound stainless steel return spring for secure closing <> Finest corrosion resistant materials for a long life <> Guaranteed 4 years - 2 year full plus 2 more on the powertube

The Superior Mk 7 S

Bayliss XL ll Vent Opener