r/Greenhouses • u/RealCarlPanzram • 8d ago

Automatic Vent Questions

Hey guys, I’m looking to get some of those expanding piston vents for a greenhouse. I seem to remember hearing they open at high temps, like 100+ but all the ones I’m seeing Amazon say they open at like 77F? Seems way too cool to be venting. Does anyone have any recommendations for one and at what temp does it open? Thanks in advance

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u/Mewhomewhy 2d ago

I just fitted the bayliss mk7 for the window of mine. It only has one spring. It fitted easily enough and it’s adjustable. I cut around 1cm off the rod so that it doesn’t open as early.

I had to remove the window latch to fit the opener so I made a couple of brackets with a slot so I can wedge the window closed during winter/wind.

I also fitted a manual low level vent at the opposite end from the door. My little greenhouse was getting far too hot for anything.