Eplenishment Air To Asement From Pstairs; Ducting - Humidex UNS-103 Installation & Owner's Manual

Humidex
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.
When the flow is limited or inaccessible between rooms downstairs (if there are walls or partitions),
then install a grille 8" x 10" (or other grill configuration, having total area of not less than 80 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.
In the initial period after installation, before the Humidex has had time to dry out the basement, and
when the air outside is hot and humid; keep the basement/crawlspace doors, windows and vents
closed to the outside. This will assure that the air is replenished with the air from upstairs and not
with the humid air from outside. Generally, for improved performance, it is best to keep all exterior
basement/crawlspace doors, windows and vents closed at all times.
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.
Note: When a Mechanical Booster Fan is used to provide replenishment air, the unit should have a
max capacity of 150 CFM.

Ducting

Unit comes in two sections that allow for flexibility in positioning the duct at the most convenient
height. You can duct from the back of the unit, or from the top of the unit by removing the top
cover. Duct can go through an outside wall, the floor joist or window. Duct should be vented above
ground level to the outside or below ground into a window well that is open and not sealed off to
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