With the removable insulated access door, the SST™ gives the servicing contractor the space they need to properly inspect, clean, diagnose and maintain the evaporator coil and the furnace heat exchanger. No more small “inspection” doors, this is true ACCESS to the system critical parts without disassembly or cutting into the system. This saves you the contractor precious time and money on call backs and trouble calls, underperforming equipment and allows your technicians to complete more calls in less time.