[Vet4jdc]

Get your money refunded.

Have CW document their mistake in writing as Montana Man said for future dealing with Keystone.

Fix the mistake like this:

1. Get a piece of 3/8" thick cabinet grade plywood.
2. Cut the plywood to fit in your closet so that at least 12" of it is above the hole and 12" below. The total length will be approximately 36" long and 16" wide total.
3. Cover the back side of the plywood with liquid nails.
4. Center the plywood on the hole and install machine screws through the plywood and into the stud top and bottom. Install the screws through the stud and inside wall only and not through the exterior.
5. Install the screws into the stud at 2" on center so that you have at least six screws above the hole and six screws below the hole.
6. You have now basically "laced" the stud back together structurally. Six screws are actually stronger than the light gage stud.
7. Install additional studs at all four corners of the plywood to keep it attached to the inside closet wall.
8. Drill the hole in the plywood for the vent to go through.
9. Paint the plywood to a color closely matching your interior finish.

I understand you will now have a piece of plywood that is seen from your closet but it is behind the dryer. Although it will be difficult to look at from an owner perspective, it will structurally hold the wall and stud together. It is not an answer for the stupidity of CW but will keep your camper from flexing and causing additional damage.