Drilling vent holes - scary stuff!!!
I need to drill two 4" vent holes in the sidewall of my 2007 Keystone Cougar. I have bought a 4" hole saw for this purpose but I am stuck at this point. How can I determine proper placement of these holes so that I don't cut through any studs, thus weakening the units integrity? Is the 4" hole saw the way to go, or is there a better approach? Do I cut from the outside in? How do I determine and avoid stud locations? Will a standard carpentry type stud finder work on fiberglass? I would greatly appreciate any thoughts or suggestions on this problem.
This project is to install a portable A/C in the bedroom. The unit on the roof works great until the temps hit the 90's, and then the bedroom becomes like a suana. The vent holes are to install intake and exhaust vents. Also, any thought on how far apart these vents should be to avoid sucking warm exhaust back into the intake vent? I had considered a second roof unit but decided that my roof would not support it.