Another option on the convection fan is to set CFT to 0 (in SETUP menu). This will force it to run at least at minimum speed all the time. You can adjust minimum speed via the CFM setting in the Advanced menu (press and hold MENU button for 15 seconds or so, then tap until it displays the "CFM" screen, use up and down buttons to adjust it). Be careful adjusting CFM as it is possible to set it so low that the motor doesn't turn, which will lead to overheating and possible damage. For safety I'd recommend finding that point at which it doesn't turn and then using a setting 5 or 10 higher as your minimum setting for CFM. Unfortunately each motor can be different for this CFM setting. We ship with a default of 30 since it is always high enough in our experience, but there is usually some room to lower it if a customer wants to experiment and take on the risk of setting it too low.