The installation must be done in the basement or the lowest, dampest, coldest level of your dwelling. Try to find an outside wall to accommodate a 6¼” exit to the exterior of the house where no electrical wires or pipes are present Minimum distance to any source of heat should be 8 feet. Make sure that you do not install the unit in a boiler room.
Also maximize the distance between the unit and the source of replenishment air (example: stairwell or openings to upper level).
For Interior Wall Installation: The distance between the Humidex back and the exterior wall should not be more than 12 feet. For this application the flex has to be replaced with rigid piping. Optional: The bottom cap may be removed for added airflow.