http://www.greenhouses.com/Jul...
Found it. Someone posted on another blog that Julianna greenhouse parts are compatible with HF -link above for the automatic window vent opener. I don't know that for sure but you could call and ask. This opener is very expensive compared to HF but "maybe" it works? If you get it and it works I'd sure like to know.
So far I still have trouble getting my windows to stay tightly closed. Frustrating.
