I am a physician, and although have no opinion on the mats (as I have never seen or used them) I can reply to the pacemaker question. The answer is product liability. Pacemakes are adjusted and turned on/off with magnets. We, (all) emergency departments have magnets to turn pacemaker off if needed. These magnets are no slouch, quite powerful, almost on par with an elemental magnet. Regardless, I suspect because it is a magnet (even though not powerful enough to affect a pacemaker) the company who makes the fan wants to ensure they are never sued for a pacemaker malfunction that occurs in the vicinity of one of their fans. I have no idea if the mats use magnets in the design, but a warning would possibly be appropriate depending on the concern off the maker of liability suits.