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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

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
Customer questions

Questions and answers

2 votes
q: What powers the automatic vent opener?
a: 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 1, 2019
Customer reviews

Customer reviews

Overall rating

4.7 out of 5 stars from 32 reviews
The Old Trout South Island

Vent Opener

3 months ago


Found them to be fairly useless.

Glasshouse Man Hamilton

Evergreen Greenhouse Automatic Vent Opener

4 months ago


Installed and operating ideally

Odin Putaruru

vent opener

5 months ago


it works fine easy to install i put 2 in my green house.

Sam Otago

Very happy

7 months ago


Works incredibly well even on our very windy section. I used nuts and bolts to secure it to the glasshouse instead of the screws supplied in the kit. I would certainly purchase another if I needed it

Chris Hawke's Bay

Evergreen Greenhouse Automatic Vent Opener

7 months ago


Easy to install and work very well.

Chris Pearson Blenheim

Evergreen Greenhouse Automatic Vent Opener

9 months ago


Great unit easy to install and works perfectly

Vajira Wellington

Excellent product

9 months ago


This automatic vent opener is a excellent product and working as advertised. Recommend for everyone.

Robbo Wellington

brilliant product

9 months ago


have installed two of these on my greenhouse, absolutely awesome system & Trade Tested were great with support, when I had a minor issue , thanks Guy's.

Mat Otago

Greenhouse window opener

10 months ago


Great product, works perfectly. I bought 4 to use in my custom built glasshouse. I had to make a custom bracket to hold the opener, easy though, and works a treat

Keith W Bay of Plenty

Evergreen Greenhouse Automatic Vent Opener

10 months ago


Won at ( Trademe ) auction for a good price, totally stoked with the installed product A+++

Vic Northland

Auto vent opener

about 1 year ago


Working well.

Pat Taranaki

Automatic Vent Opener

about 1 year ago


The instructions were a bit confusing but after fitting it as I felt it should be, the opener works superbly. Reccomended

Steve Otago

Automatic vent opener

about 1 year ago


Good product but smell way to override with conventional handle would be good.

Rick Auckland

Great Product works well

about 1 year ago


Great product, works very well.

Bob Waihi

Excellent product

about 1 year ago


works exactly as I hoped. Fully closed at 20 degrees C and fully open over 30. A little bit fiddly to install. Don't use a high speed drill to drill out the rivets. A slower speed battery drill with a 4mm bit is much better. Use rivets to fit the adjustor to the window rather than the self tappers supplied as they are too long. The other end is easy just using the two captive bolts from the manual system. Adjustor screws in or out to adjust but I did have to screw in to the limit. Check at various temperatures and don't forget to remove the cotter pin.

Russell Otago

Greenhouse Vent Opener

about 1 year ago


Great!!! A bit fiddly to install but so worth it. Wish we'd added them when we bought the greenhouse a few years back.

Peter Wellington

Auto window opener

about 1 year ago


Cleaver little item that works well

Al southland

glasshouse automatic vent

about 1 year ago


great product.

Thommo Renwick

auto vent openers

about 1 year ago


the auto vent openers are great just fit them and walk away.

Bully Otago

excellent product

about 1 year ago


This auto opener is sturdy and easy to install. Good value and a game changer for the green house.

Roly Hawkes Bay

Save your plants

about 1 year ago


A great device, well worth the cost. Relatively simple to install. You never forget to open your vents again.

Elle Wellington

Well worth it!

over 2 years ago


A simple and very easy to install device that works fantastically. Really nice to buy something that performs just as advertised.

Mama G Christchurch

Evergreen Greenhouse Auto vent opener

over 2 years ago


Great product, highly recommend.

JonPierre Rangiora

Evergreen Greenhouse Automatic Vent Opener

over 2 years ago


Working really well, saves having to remember to open and close. Would definitely recommend to a friend.

Mitch Christchurch

Does a great job!

over 2 years ago


Fitted and working, no problems.

Chas Canterbury

Works great

over 2 years ago


I would definitely buy one again

Paul Otago

Trouble free

over 2 years ago


These are a great addition to my hot house, trouble free and reliable

Bill Wellington

inituitive design

over 3 years ago


Excellent product that worked well on my new greenhouse.

AJ Canterbury

Must Have!

over 3 years ago


These are simply the best you really need one for each window.

Farmer Otago

Work really well

over 3 years ago


Had two operating for the last two seasons that was my reason for three more 

Wes Gisborne


over 3 years ago


Installed auto vent when I built the greenhouse. The unit did not fit right out of the box I had to make some bits to mount it so it can close properly, but once on it works very well, well worth it

Mobychev Auckland

Simple and brilliant

over 4 years ago


Best investment i have made, saves burning a lot of plants.Very reliable too.

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