Evaporative Cooling Distribution & Return Kit, 10’ Complete, Closed Top Semi gable class=Learning for guide on assembling class=Learning for guide on assembling TrolMaster systems GrowControl™ RD8i relay independently operates eight dry contacts for control of equipment such as: HVAC systems FEATURES:Distribution & Return System Features:High efficiency systemLargest self contained PVC return gutter on the market todaySubmersible pumpsPad Features:Water is spread evenly over the pad surface as a film rather than droplets for uniform wettingPad surface dries quickly in absence of water to inhibit micro organism growthCoated pads are tough and durable for repeated cleaning Our Pad System is designed to enhance the cooling capability of your current ventilation system to further reduce the temperature in your greenhouse