Full Product Manual
Humidex
10
Installation HCS-BS / HCS-CS
Replenishment air to Basement from Upstairs
The damp air exhausted by the Humidex must be replaced by the warmer/drier air from the upper
levels. If there is no open stairwell, the airflow is restricted from coming down, then install a passive
return grille with 100 sq. inches either in the door, in the wall, or in the floor to allow unobstructed
air downstairs. Alternatively, you can shave down the door leading to the basement by 2”-3”. For the
HCS-CS with BSF, a replenishment grille is provided with the booster fan.
When the flow is limited or inaccessible between rooms downstairs (if there are walls or partitions),
then install a grille 10” x 14” (or other grill configuration, having total area of not less than 100 sq. in.)
in the bottom of the door or wall to avoid having stagnant air in those areas. Otherwise interior doors
must remain open. This insures that all the air drawn into the Humidex comes from all areas of the
basement.
Generally, for improved performance, it is best to keep all exterior basement/crawlspace doors,
windows and vents closed. This will assure that the air is replenished with the air from upstairs and
not with the humid air from outside.
Please check to make sure there are no openings/leaks around windows, doors, vents or other places,
where outside humid air can enter the basement/crawlspace. Make sure that A/C Ducts are properly
sealed and that all A/C Leads to the basement are closed. Sump Pumps holes should be properly
covered.
The replenishment air area must have a minimum size of 100 sq.in.