Space looks good do u plan on using all of it? Um as for not wanting to cut holes or anything like that would be fine but u would have to leave the closet door opened a bit. It doesnt have to wide opened but just a little bit in order to get some fresh air in. You will also need to take the stale air out with a fan again (u dont want to make holes) u need the door opened. Good luck I think the 400w is perfect especially with the cooled hood. If u dont mind me asking how much was the hood and can we see a pic?:thumbsup: