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How to fit an automatic greenhouse vent opener


Make sure your greenhouse ventilation is constantly regulated during hot summer months, whether you're at home or not, by installing an automatic vent opener. Readily available, they're quick and easy to install, so heat-stressed plants will be a thing of the past.

How to do it


Place the opener in the centre of a window vent and mark the position of the holes on the window frame and greenhouse frame.


Screw the automatic window opener to the frame of the window then check that the window can open and close.


If necessary, adjust the amount the window opens by rotating the main tube of the vent opener.


On a sunny day, watch and wait to see that the vent is opening properly.

Our tip

Fit opening windows on the side of the greenhouse which faces away from prevailing winds.

UPVC greenhouses have lightweight roof vents and may require a stronger vent opener to keep them closed or prevent them being blown away.

Discuss this project

Talkback: How to fit an automatic greenhouse vent opener
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Ashdene 24/11/2011 at 15:27

This is a must if you are going to use your greenhouse to the full. Fitted my vents when I built the greenhouse 10 years ago and have only just had one fail last week, even with the high cost to buy they are well worth it.

rogerdennis 24/11/2011 at 15:27

I have got do this after I put up my new greenhouse later this year,hopefully at Easter if the weather is ok

dave5 30/01/2012 at 15:37

hi i fitted bottom bracket but top bracket is way out only fits if window is lifted up is this the way to fit it and will it shut thanx

Jimbolena 14/07/2013 at 23:16

Great advice on the UPVC roof vents, if I'd not read this they would blown away, so I'm in the process of securing them a little better.

Thanks for the advice.

ZombieGardener 16/07/2013 at 05:28

When the greenhouse was built in May I had one fitted, but the fitter put it on. I have just ordered one more, so i'm going to have a go at fitting it when it comes. I go out early at the mo, open the manual one whilst I wet the floor. Im leaving the door open to but it's still going well into 40'sC. I'm thinking i might need to invest in some shade netting. Does anyone here use it, and could reccomend something? Also back to the autovents, should i then remove the autovent's in winter and put the manual one's back on?

Thanks and sorry for highjacking your thread. all advice would be greatly appreciated.

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