Running MBP 15 with lid closed and external screen = damaging screen?

I connected an external screen to my laptop with the lid closed and woke it up through my external keyboard. I am vaguely remembering reports stating that heat is vented through the keyboard as well as through the vents in the back.
Does that mean that running the laptop with the lid closed is damaging the machine or specifically the screen?

No, it's fine.

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