Vent Openers

Automatic Greenhouse Vent Openers, Greenhouse Venting & Greenhouse Accessories

Sometimes we are overwhelmed with the responsibility of managing everything in our lives. Greenhouse temperatures are no exception. Free yourself from worry, responsibility and indecision and let the automatic greenhouse vent openers regulate the temperatures for you. You’ll be able to go on vacation without hiring someone to open and close up your greenhouse.

The automatic solar greenhouse vent openers are heat activated and require no electricity to operate. The upper and lower automatic greenhouse vents open and close at an adjustable preset temperature due to the expansion and contraction of beeswax in a piston. Greenhouse venting and cooling of the Growing Dome ® is then achieved as hot air escapes from the top vents and cold air is drawn in through the lower vents. Overheating of the Growing Domes is prevented due to this “chimney” effect. The solar greenhouse vent openers can be easily disconnected to close the vents at will. The three types of openers Growing Spaces provides for the Growing Dome green houses are described below.

Univent Solar Greenhouse Vent Openers

The solar greenhouse vent openers that are standard on the smaller sized vents are the Univent Openers. These openers are reliable and efficient automatic vent openers. These greenhouse accessories feature threaded pistons that are easy to adjust, which means you have control over when your vents open and close. When greenhouse venting isn’t needed, the Univent Openers are simply disabled by squeezing the arms together and disconnecting from the mounting bracket – it is good to do this in winter if snow builds up on the outside of geodesic Growing Dome green house.
We have been using these openers for decades on our Growing Domes and our customers have been very happy with their performance. It is for this reason that they are standard on all of our smaller vents. The 15ft. and 22ft. Growing Domes have Univent openers standard on all of the solar greenhouse vents because the vents are smaller and lighter on these sizes.

Bayliss Hydraulicheck Automatic Greenhouse Vent Opener

The sturdy Bayliss Hydraulicheck solar greenhouse vent openers are custom made in the UK. The Bayliss openers are perfect for our mid-sized greenhouse vents and as an upgrade on the smaller vents as a part of the Windy Weather Package. These automatic openers allow the geodesic Growing Domes to withstand high winds. This solar greenhouse accessory offers a “hydraulicheck” feature that prevents the vent from being jerked open by strong winds. The solar greenhouse vent openers are highly recommended for Growing Dome green houses that are on a hilltop or ridge exposed to prevailing winds, that are located in an area that receives gusts in excess of 60 mph, and/or that are in a very windy area.

As part of Growing Spaces’ Windy Weather Package, owners of 15ft. through 26ft. diameter Growing Dome kits receive a prescribed number of Bayliss Openers per automatic greenhouse vent to protect the vents from wind damage. For more information on which vents on which size Growing Domes receive Bayliss openers as part of the Windy Weather Package – also see our Sizes & Prices page.
The 18 ft. and the 26 ft. Growing Domes come standard with Bayliss Hydraulicheck openers on the top vents because the larger size and weight of the greenhouse vents require more lifting power on the upper vents.

Gigavent Automatic Greenhouse Vent Opener

In the past, for the larger and heavier greenhouse vents installed in windy locations we would add two of the sturdy Bayliss Hydraulicheck solar greenhouse vent openers to each top vent. This has proved a trustworthy option for many, many years. Now we have been fortunate to discover and successfully test the Gigavent opener and have found it to be an even better option than before.

The Gigavent automatic greenhouse vent opener is made in Denmark with a unique damper and powerful spring built into it to withstand strong winds just like the Bayliss Hydraulicheck openers. The difference is that we only need one, not two, of these openers on the larger vents in windy areas because they are able to handle an astounding 60 pounds of weight.

The added bonus is that these automatic greenhouse vent openers open the vents 6 inches wider than the Bayliss openers! The total 18 inch opening allows for increased airflow which aids in relieving overheating in the larger Growing Domes. This is why we’ve made these openers standard on our 33 ft. and 42 ft. Growing Domes.

With the purchase of the Windy Weather Package for the 18 ft. and 26 ft. kits the Gigavents replace the top vent openers and the Bayliss Hydraulicheck openers are added to the lower vents. For more information on the Windy Weather Package – also see our Sizes & Prices page.

In the place of lower vents on the larger Growing Domes (33 ft. and 42 ft. diameter), the greenhouse accessories include cooling fans that are automatically regulated.