300 degree's?????
The overheat cutout on these fans trips at well below that, I can tell you.
This is not a hair dryer, it is a tip over protected, overheat protected fan heater in which you can choose the temp and fan speed, that sits on a shelf 12inchs higher then the bottom of the freezer.
Use what you like, but im stoked with it, it does a damn good job, and in my mechanical/auto electrical trade and cert 4 in safety training, it is safe.
We mostly all have electrical cords inside our fermentation fridges anyway, thats not safe in many peoples eyes, but we do it...