Quote Originally Posted by nikkubus View Post
Glad they finally found your tub, what a pain. I'd go for the upper sides vs the lid personally for ventilation because you get nice crossflow, but evaporation holds in a bit better. I'll let someone with carpet experience answer the correct amount. The ribs shouldn't be a problem, a little air gap between the heat pad is fine.

I went around the tub and used a soldering iron to put a hole every 3 inches, I believe that should be enough. I can double that up if needed.