My GMG does have the fan blowing down the auger to prevent burnback , and the manual states that it should be turned off by turning temp. down to 150 and clicking down button once more. This starts fan mode for 15 min. Both hopper and combustion fans run at this time. A nice safety feature, and whether your grill has that or not, like GG said, it's a wise thing to do before shutting down. Thanks for bringing this up Don!