We offer the best selection of quality made solar vent openers in the USA. All window openers open and close automatically based on air temperature and offer adjustable temperature settings. These are great solutions for automating side and roof vent windows on greenhouse kits and cold frames. Want more information about how they work and/or which vent opener is best for your application? Visit our Adding Automatic Vent Openers to your Greenhouse article. Dealer inquiries are welcome.

Products 1-8 of 8
Show
Bayliss MK7 Triple Spring Auto Vent Opener bayliss, opener, vent, auto, window, automatic, solar, mk7, roof, side, louver, greenhouse, air, orchid, wax, autovent
Sale!
Price: $64.95
(4)
Availability: In Stock - Usually ships in 1 to 2 days.

    These Bayliss MK7 openers have three heavy-duty springs which gives the opener superior closing power making it ideal for side wall vents and roof vents in windy areas. Opening temperature is adjustable (Ranges shown below). Maximum opening of 12" is reached at approximately 20° to 30°F above opening temperature. Bayliss MK7 vent openers are made from the best corrosion resistant materials: stainless steel, anodized aluminum, and brass. These are recommended for use with Cross Country...

    Univent Automatic Vent Opener vent, opener, univent, automatic, solar, window, greenhouse, roof, auto, cold, frame, wax,
    Price: $38.95
    (12)
    Availability: In Stock - Usually ships in 1 to 2 days.
    Item #: 8040120 -

      The Univent allows solar powered control of top and side mounted window vents thanks to its dual springs. Univent window openers have an adjustable opening temperature of 60° F to 75° F and an 18" maximum opening which would be reached at approximately 20° to 30°F above opening temperature. Univent openers are made from corrosion resistant materials including aluminum and stainless steel. Univents also feature a unique quick disconnect feature on the bottom of the unit which is useful when...

      Ventomax Automatic Vent Opener vent, opener, ventomax, automatic, solar, window, greenhouse, roof, auto, cold, frame, wax, orbesen, teknik
      Retail: $31.95
      Price: $24.95
      (2)
      Availability: In Stock - Usually ships in 1 to 2 days.
      Item #: 8040160 -

        The Ventomax opener allows solar powered control of top mounted window vents for a very affordable. Ventomax window openers have an adjustable opening temperature of 60° F to 75° F and an 18" maximum opening which would be reached at approximately 20° to 30°F above opening temperature. Ventomax openers are made from corrosion resistant electro galvanized steel painted black. Recommended for roof vents only. Order more than one and save! Ventomax Features Adjustable opening temperature of 60° F...

        Gigavent Auto Vent Opener vent, window, opener, roof, automatic, solar, auto, greenhouse, cold, frame, gigavent, wax
        Sale!
        Retail: $129.00
        Price: $99.95
        (1)
        Availability: In Stock - Usually ships in 1 to 2 days.
        Item #: 8040150 -

          This is the strongest vent opener available with a lifting capacity of 65 lbs. It has a hydraulic cylinder which provides superior protection in windy areas. Opening temperature can be adjusted from 56° F to 70° F and maximum opening of 18" is reached at approximately 20° F above opening temperature. Gigavent cylinder can be located in many different positions for maximum mounting flexibility. This model is too large for use with all of our greenhouses except some of the Cross Country...

          Grow More / Solar Harvest Automatic Vent Opener grow, more, greenhouse, kits, vent, opener, univent, automatic, solar, window, harvest
          Price: $38.95
          (1)
          Availability: In Stock - Usually ships in 1 to 2 days.
          Item #: 2532031 -

            The Univent allows solar-powered control of top and side mounted window vents thanks to its dual springs. Univent window openers have an adjustable opening temperature of 60° F to 75° F and an 18" maximum opening which would be reached at approximately 20° to 30°F above opening temperature. Univents are made from corrosion resistant materials including aluminum and stainless steel. This model is recommended for use with Grow More and Solar Harvest greenhouse vents because they include a...

            Bayliss MK7 Replacement Power Tube bayliss, mk7, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part
            Price: $26.95
            (6)
            Availability: In Stock - Usually ships in 1 to 2 days.

              Bayliss power tube life is not infinite. Over the years, the piston moving through the seals gradually wears the seal material away, allowing a gradual seepage of wax out of the tube. This in turn reduces the pressure within the tube and eventually the opening distance achieved will be affected. This is when you need to replace the power tube cylinder.Bayliss MK7 power tubes are available with 2 different models. The only difference is the operational temperatures of the power tube. The Orchid...

              Gigavent Replacement Power Tube gigavent, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part
              Price: $69.95
              Availability: In Stock - Usually ships in 1 to 2 days.
              Item #: 8040155 -

                This cylinder tube powers the Gigavent automatic openers with no need for electricity. It contains a mineral wax which expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston. Made in Denmark.While this cylinder for the Gigavent automatic vent opener lasts a long time, eventually the piston rod moving through the seals will wear the seal material away, allowing...

                Univent / Ventomax Replacement Power Tube univent, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part, ventomax
                Price: $19.95
                (1)
                Availability: In Stock - Usually ships in 1 to 2 days.
                Item #: 8040130 -

                  This cylinder tube powers the Univent and Ventomax automatic openers with no need for electricity. It contains a mineral wax which expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston. Made in Denmark. While this automatic vent opener cylinder lasts a long time, eventually the piston rod moving through the seals will wear the seal material away, allowing a...