Ducting to HVAC System –
Basement and Attic Installations
The
Preferred Installation
is to duct the dehumidifier to
pull air from and return dehumidified air to the HVAC return
duct. This installation will ensure warm, dehumidified air is
thoroughly mixed with the HVAC system air before being
discharged into the living space.
The dehumidifier must be wired to turn on the HVAC
fan when operating (see page 11).
Required Component
10" Duct
Ducting for Stand Alone Installations
or Non-Ducted Installations
In this installation the dehumidifier is not ducted to the
HVAC system and is used to dehumidify a specific area.
This installation is typically in basements or crawl spaces.
Optional Components
10" Duct
Grilles with 10" Duct Collars
Ducting Notes:
• Use insulated duct when the dehumidifier is located in
an unconditioned space such as an attic or a garage.
• Use a minimum of 12" of flex duct at the dehumidifier
inlet and outlet to prevent vibration noise transmission.
• When ducting return to supply, allow adequate space
before the first branch duct to ensure the warm
dehumidified air is thoroughly mixed with the HVAC
system air.
PLENUM BOX OR Y-FITTING
6 FT. MIN.
AIR HANDLER
FILTER
10" DIA. INSULATED DUCT
BOTH SIDES
CONDENSATE PAN
HVAC/FURNACE
AIR IS PULLED
FROM AND
SUPPLIED TO THE
RETURN DUCT
10” DUCT
DEHUMIDIFIER
6 ft
MIN
90-1886
90-1888
Figure 11. Preferred Basement Installation
Figure 13. Stand Alone Ducted
Figure 12. Preferred Attic Installation
DEHUMIDIFIER
DEHUMIDIFIED AIR IS SUPPLIED TO DUCTED SPACE
AIR IS PULLED
FROM DUCTED
SPACE
10' MIN
GRILLE WITH
10" DUCT COLLAR
2 PLACES
DEHUMIDIFIED SPACE
90-1893
7
