Ooops. The link is really the one below. marbs Here is a link that might be useful: HFGH greenhouse constuction & improvements

Hi Mark, congratulations! The vents on my 10x12 are my least favorite part of the greenhouse. I do have them all working, but they seem quite flimsy and the fit is rather fussy. They are noisy in wind. I do have a larger gap on the corner of the vent closest to the overlap of the roof crown pieces (parts 10 and 11) as you mentioned, although it seems to open and close OK. I am impressed you built it by yourself. It would have been very, very difficult for me to get this up without the good help of my husband. Those of you who go it alone get a tip of the hat from me. I ended up following oraylawsons idea about using an adhesive to attach the bottom door rail frame to the base frame. That worked out well. Boy, I totally missed this tip! Wish I had thought of that, I really don't like how loosely the bottom door frame slides and moves on the base frame. Our greenhouse is hot too. With the doors open and all vents open, my greenhouse is at least 120 lately (that's as high as my cheap thermometer goes, I suspect it's higher.) Ventilation and cooling are next on the list of challenges. I will keep my fingers crossed for you on the high winds issue (and crossed for us too.) With all the good modifications given on this site, I'm pretty confident things will go well. One of my concerns is what will happen when we get a big gust of wind when I have the doors and vents open for cooling. I can batten down the house and secure the doors for oncoming storms, but our random sudden wind gusts here are kind of uncharted territory. I hope you will keep us posted on how things go for you! Sheri

Harbor Freight did not suggest this. Lets just say that Harbor Freights Tech support was, um Harbor Freight... I have to admit it was nice, they Cross shipped me new ones, which performed the same as the old ones. I found an overseas manufacturer of similar "budget vents", I think they were called Thermofor, who was very helpfull, and gave me a suggestion. I unscrewed the endcap that has the adjustment screw, and press the plunger till the seal almost comes out, then the oil will start to leak if you press softly on the plunger (If I pressed hard the seal comes all the way out, and you get a big mess ;) then close the whole thing and test. THrough trial and error, I now have all five of my HF openers opening between 65 and 75 degrees. Gato, I am not sure why mine did not work, and yours did, I am only 1300 feet higher than you, but I had a Total of ten from HF (The first five and the second five). Even at 38 degrees they were open five inches under load before I modified them ;) I would not recomend that anyone else try this, because I am sure it voids the warranty. (I tried it on just one first, then got bolder and tried the rest. I did spill all the oil out of one, and I replaced the oil with Cooking oil, even this one is now working ;) so I guess I will have to wait and see if opening them is gonna cause any long term ill effects.

THey are so easy! These are the clips you squeeze to open them, and have teeth that clamp onto any place you put them. They come in different styles and sizes. I got the small ones and covered the part that gets squeezed with a daisy-looking crocheted flower. G-hook, worsted yarn. Chain 4, slip stitch to form ring. Sc 8 times into center of ring. Sc around, increasing now and then to form a flat circle. Stop when big enough to cover squeeze handles, about 2 rounds.Cut the yarn, leaving a tail that will be sewn using a tapestry needle to form a drawstring to fit snugly around base of handles. Pull snugly, not too tight. Test to be sure the clip still opens. Tie off, weave in. Insert hook into any loop around the edge to begin the flower petals. Ch8, sl st into beginning st. Repeat as many times as looks good to you, perhaps 8 to 12 petals. Tie off, weave in.