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Evergreen Greenhouse Automatic Vent Opener

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Evergreen Greenhouse / Glasshouse Auto-Opening Vent.

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Product overview

Evergreen Greenhouse / Glasshouse Auto-Opening Vent.

Top quality product backed by our 12 month warranty. Thermostat mechanism, automatically opens and closes the vent at a set temperature.

Its automatic operation adjusts the ventilation as temperature changes, allowing for optimal air flow in your greenhouse. No more worrying about your flowers and plants, even when you're away.

There's no need for troublesome cables or regular battery replacements.

- Starts to open at 18-25°C
- Fully open at 35°C and above
- Maximum extension of 45cm
- Maximum open weight 7kg

Similar models from other suppliers come in at $130+

Weight: 0.5kg
Packed carton size: 8.5cm x 5cm x 28.5cm

Average thickness of aluminium profiles: at least 1.5mm


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Questions and answers

11 votes
What powers the automatic vent opener?
It acts like a thermostat, the piston contains a mineral wax that expands when heated, opening the window. As the temperature drops this contracts and, with the help of the spring, closes the window.
By Trade Tested on April 01 2019
0 votes
Can the device be bypassed to keep the vent shut (on a windy day)?
Yes it can
By Trade Tested on January 15 2024
2 votes
Would this work on other brands of greenhouses? Are they pretty standard sizes?
Yes should do.
By Trade Tested on May 04 2020
1 vote
Hi, can i install it on a regular window?
Sure, if it's not too heavy.
By Trade Tested on May 25 2020
0 votes
Can we use this for a vertical window instead of a horizontal one?
Yes, this would work with a vertical window too.
By Trade Tested on April 05 2022
-2 votes
Will auto opener work on tunnel house with push up roof vent
It will work on most green houses.
By Trade Tested on July 19 2021
0 votes
Will this work on the louver windows style the one that has 4 or so blades of glass?
Yes most likely.
By Trade Tested on February 02 2021
-1 votes
Hi, does it have one or two springs?
It has 1 spring.
By Trade Tested on October 12 2020
0 votes
Can the device be bypassed, ie opened manually without much effort?
Not easily, you would need to remove a actuator rod.
By Trade Tested on October 07 2020
0 votes
Can the opening temperature be regulated or is it permanently set. Thank you.
No it is permanently set (it's a mercury switch).
By Trade Tested on September 02 2020
See more questions and answers (2)

Overall rating

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All reviews (75)

Read reviews that mention

  • opener work
  • once installed
  • screw supplied
Evergreen Greenhouse Automatic Vent Opener

Initially ordered two for my 10' x 8' Greenhouse. They work a treat so I ordered a third - leaving one window to be manually operated. The third one came without the fixing screws and pins. Fortunately the initial order had extras. Recommend these for sure.

Graeme Auckland
Greenhouse auto vent opener

Very good easy to fit work great

Mal Paeroa
Automatic vent opener

Will do the job. Fitment instructions were marginal.

Glen Canterbury
No, I do not recommend this product.
Automatic Opener

Bought 2 to see how well they worked. Have now ordered another 2 as they work well. Again the instructions were not easy to follow. The screws supplied were too small for the holes left by the rivets from the manual openers.

Bruno3 Pukekohe
Vent fittings

Very fiddley to fit but worth having

Muzzza Levin
Evergreen Greenhouse Automatic Vent Opener

Works well.

Norm Otago
Does the job well

Does the job nicely. I wouldn't recommend drilling out the holes of the existing rivets on the standard opener though. Just place the opener next to it.

Charlienz Auckland
No, I do not recommend this product.

Amazing product, such a clever device

Zar Bay of Plenty
Works well

Nicely finished compact product that is performing very well and looks very tidy.

Nick Dunedin
Very clever device

The opener works well, is easy to install, and operated as described.

A L Whanganui