Nintendo Switch fan is weird?

I just noticed something strange about my switch when I started a game (Hatsune miku Project diva mega mix) the fan started running and a lot of air came out, so I put it in standby mode and turned it on again now I hear the fan not at all and hardly feel any air I'm afraid of what will break

Fans turn up when a lot of graphics are used because the power generates heat so something is completely normal. ^^

Thanks, I'm relieved. (⌒‿⌒)