Peter, mine is set up with the metering rolls on remote #4 on the tractor and the fan is remote #3. They are not plumbed together in any way on mine. It has a total of 5 circuits, lift, fold, fan, metering rolls, markers. I'll crank up the fan some though to insure the fertilizer is not laying in the low places of the hoses. Also, there are no Flexi coil dealers near here, where would be a good place to call that has things for this 1740 in stock? I can see I'll be needing some of the rubber seals underneath pretty soon and who knows what else eventually!