I just picked up the Simspon Dura-Vent 3000 Kit. This comes with the wall thimble and all the piping that runs up the side of the house. I do have some questions about the thimble installation because the instructions are rather vague. 1. It looks like I need to cut away the wallboard and then mount the thimble on to the studs on either side. This would make the thimble flush against the wallboard, is this correct? If this is the case, what should use as a sealant around the thimble. 2. For the pipe that you push through the thimble, what should I use to lock it in place and seal the gap between the pipe and the thimble? Should I use the RTV sealant that they speak of in the instructions? 3. On the outside of the house I have vinyl. should I use the aluminum thimble they give me and then just put some J-channel around it? Thanks for any help!