From the Sun-court web site instructions:
"Your In-Line Duct Fan™ must be connected to a 110/120 Volt AC, 60Hz fuse or circuit breaker protected power source only in a manner approved by all applicable codes. Never connect your In-Line Duct Fan™ to a 240 Volt AC blower motor or other 240 Volt system. All electrical connections to this fan must be made in an approved junction box. This junction box must be permanently attached to the fan at the point where the motor wires exit the metal duct pipe. The junction box must be reliably mounted to prevent it from shifting or rotating. The junction box can be attached with 2 or more sheet metal screws, rivets or machine screws with a nut and lock washer. Power to the fan must be supplied following all applicable building and electrical codes."