I use my W530 on my couch frequently, with no issues. The main cooling happens in the back corner, where there are vents on both the side and the back. I'm not

I use my W530 on my couch frequently, with no issues. The main cooling happens in the back corner, where there are vents on both the side and the back. I'm not sure what the bottom vents are for, but blocking them doesn't cause issues even when I'm gaming.