Abstract: An air handling system includes an air handling device connectable to a duct network that is underneath a field having grass growing in it, at least one sensor disposed to measure a variable associated with the field, and a control unit connected to the air handling device to control operating parameters of the air handling device responsive to an output from the sensor. A heat exchanger is optionally part of the system. The variables associated with the field include temperature and moisture. The operating parameters of the air handling device include direction of the air flow, temperature of the air directed into the duct network, and the time of operation of the unit. The system optionally includes programmable control logic so that the sensor output automatically controls the operating parameters of the system. A computer with display is used to program the control logic, which can be done remotely over a modem or the internet.

Abstract: A fan unit has inlet and outlet ducts facing in the same direction. A reversing shuttle is connected to the inlet and outlet ducts of the fan unit and includes a diverter damper and two opposing dampers. The reversing shuttle further includes an outlet that is connectable to a duct network that is under a sports field or portions of a golf course. When the fan unit is running, depending on how the opposing dampers and diverter damper are positioned, air is either blown into the duct network, thereby causing air and possibly other additives to enter the soil profile of the field, or sucked (vacuumed) from the duct network, thereby draining moisture through the soil profile and into the duct network. Moving the diverter damper from a first position to a second position while changing which of the opposing dampers is open and which is closed reverses the air flow in the duct network.