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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: 1kg
Packed carton size: 8.5cm x 5cm x 28.5cm

Average thickness of aluminium profiles: at least 1.5mm


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0800 800 880

Questions and answers

0 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
10 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
1 vote
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
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Read reviews that mention


Exactly what I needed, and easy to install.

rny Southland
Oh Dear!

This was a Christmas gift for my husband which he assembled earlier than Christmas. We have not been able to make it work, despite trying very hard and checking with the instructions. It just does not work. Great idea and principle but... So sadly not able to give a helpful review.

Grumpy Gran Canterbury
No, I do not recommend this product.
Reply from Trade Tested These units start to open between 18-25°C and fully open at 35°C and above, discussed instructions for operation with customer and they are happy with the product.
Does the trick

Bit hard to install on the evergreen greenhouse.

Naomi Waikato
Great addition to the greenhouse

The opener works a treat....definitely a must to get with the greenhouse.

Andy Tauranga
Great product

A must for all green houses. Easy to fit. No more worries about venting and over cooking the plants. Highly recommended.

Finlay Banks Canterbury