We threw ours away. Total waste of money. They fail just after the warranty runs out (three months, I think).

Someone on here has a great tutorial with pics on how they installed REAL vent openers. I open mine by hand, using a long pole whose real purpose is changing light bulbs.

Nell

After a little research and reading testimonials, I purchased a Bayliss MK7, IMHO worth the money.

Dan

The HF vent openers are terrible. I went hi-tech with mine. Here's a link to my modifications...

Here is a link that might be useful: motorize openers

Bummer, I just ordered one of these as a trial. If it worked I was going to order 4 more (I have 5 vents.)

I noticed someone said this:
"I open mine by hand, using a long pole whose real purpose is changing light bulbs."

What type of hardware to you have to keep vents open? (I'd like to open mine with a pole, but not sure which hardware to use to hold them open once I push them up.) Also, how do you close them? Must have some kind of hook you can pull down on? My vents are high up.

It is I who uses the light bulb changer pole to open my vents, and close them. The Harbor Freight GH comes with a window support handle, and a little window stop that is about two inches wide and has a little ball that sticks up on which to latch the handle.

The window handle (support) is a piece of hinged aluminum U-channel with slots cut in the flat side. It swivels and hooks over the window stop. It's a real trick to stand on the floor and reach over head to open and close the window and get that piece of metal hooked over the stop. I stick the wire on the light bulb changer into one of the holes in the support. I looked at some of the HFGH threads for a picture of the stop and handle; mudhouse has one.

I expect you could search GH suppliers and find a device that will work in your greenhouse.

Nell

Here is a link that might be useful: Mudhouse's blog; scroll to the 4th pic for handle

I purchased 2 HF solar fans to replace the original ones that came with my greenhouse. They have both been in use for over a year now, with absolutely no problems.

Trying to find update info.
Has anyone in zone 5 used the HF vents? It seems as if most of the replies are from folks in warmer zones. Wouldnt the vents get used much more in warmer climates.

Appreciate all the info we can get.... :)