We already bought a fan, Shurflo gold and will have to cut the hole for it.
We also wanted to put a new exit hatch in the place of the old one that is cracking and mildew stained. Are we supposed to do the work from the inside? It seems to me that some of the work will have to take place above, and I am not sure how we are supposed to go about this. The old exit hatch is held in with rivits, and I am not sure how to remove them either. I know this has been discussed before, but I can not find the thread.