Realized (in Time!) that I Was Blocking My Inspiron's Fan

I recently started folding my Inspiron 11-3147 into tablet mode while I recline on couch or bed. Only when I got up after a couple of hours last night did it occur to me that the fan exhaust outlet had been planted smack-down into my shirt around my stomach. No harm to me, but I'm guessing this is not good procedure to follow for healthy computer life. Did anyone else find this easy to overlook when they first started using the Inspiron as a tablet? The problem is that Dell has made it so sleek, quiet, and accommodating that a novice user can easily lose track of the fan's location (when folding) or that it even exists! I didn't receive any on-screen overheating warnings or shut-downs so I'm guessing everything's going to be all right.

SOLUTION: Fold to tablet and make sure hinges and Start button are on top when resting laptop on recumbent body. The screen view, of course, will automatically rotate.

I wonder though... if maybe there ought to be some indicator/sensor that warns users when they're obstructing the fan? ... before it may be too late.