Sukup Axial Fan Heater Manual - 18 SOLID STATE HEATER OPERATION 1. Heater power cord must be plugged into burner receptacle on fan for safe operation. This interlocks the fan with heater, assuring fan will be on before the heater.. • Sukup 24” and 28” fans are designed to partner with a Sukup Heater for grain drying at lower static pressures. They may also be used alone for pressure. Sukup Manufacturing is a leader in the grain drying industry. Sukups Portable Grain Dryer line is the home of the patented Quad-Metering Rolls. An invention that.