Blower is installed inside but out of the way so the keg will not damage it. Preferably where it can pick up the coldest air. Do not insulate the tube. Simply route it up into the tower so the air is forced up to the back of the shank and then returns back to the kegerator through the tower.
Which bracket did you purchase? If this
bracket is used, Bolt the blower to the bracket and then use self tapping screws to secure the bracket to inside wall or ceiling - whichever makes the most sense. Electrical tape works well for securing the flex tube to this bracket.
Drill a small hole (3/8"??)either in the back of the unit or in the side wall for the electrical cord. Do not drill in an area that may damage the unit. Before attaching the cord to the motor, route it through this hole and then using wire nuts, make your connections. Use silicone or plumbers putty to seal hole.
Scott Zuhse, Instructor
Micro Matic Dispense Institute