Price: $38.95
Availability: In Stock - Usually ships in 1 to 2 days.



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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 using the opener with a cold frame. This model is recommended for use with Grow More, Solar Harvest, & most other greenhouse vents. Order more than one and save!

Univent Features

  • Adjustable opening temperature of 60° F to 75° F
  • Maximum opening of 18"
  • Recommended for vents up to 15 lbs.
  • Quick disconnect feature for cold frames
  • Equipped with dual springs for windy locations
  • Made in Denmark

How does a Greenhouse Autovent work?
A strong metal tube 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.

Product Manuals, Tips, Specs, & Guides

Univent Opener Instruction Manual
Univent Opener Installation Video

Overall Customer Rating of 12 Reviews:

univent automatic vent opener

Clear instructions, easy to assemble and works like a charm. I couldn't ask for more.


Great Product

We have had a couple of uni-vents in our greenhouse and decided to replace two manual vents. The video installation instructions were marginally helpful. By the time I installed the second one, I deconstructed it and installed it separately. Soaking the cylinder in ice water really adjusts the beeswax. Overall, we are super happy.


I've got this to our old greenhouse.

My greenhouse vent broke in my old greenhouse and I found this company and brought the universal vent. It work like a charm. My plants appreciate that in our greenhouse. I recommend this product. Thank you!


These are great

They install very easy. I like them, because when the wind is strong, you can disable them from opening the windows

Great cover lifter

This lifter works great for us. We use it to open the cover and vent our cold frame. Extremely well built. Looking forward to years of seasonal use! Also appreciate the great service of this business. They carry quality products and provide timely service.