Googled it. The hydraulic model is fooking badazz. How would you work the scissor with your foot though?!?? I see bottle jacks as cheap as $20 on Amazon....
My stack vent goes straight out the side wall. No elbows nor screens. My bath vent is a wall vent with sprung damper.
They're both on the back of the shop, so aesthetics are of no concern.
If you haven't installed the fan yet, I suggest using a high CFM model. It pulls more cool/warm...
Strongly recommend tongue and groove plywood instead of OSB. You can paint it and it will look way better than OSB.... Plus it won't break out when you try to hang heavier things on it.