6
MOUNT INTAKE HOOD
Install a weather tight hood with a bird screen�
Cut a hole in the exterior wall that is large enough to fit 6” insulated flexible duct through with minimal compression of the insulation.
Pull the duct through the hole and attach the flex duct to the collar of the hood. Use metal foil tape or a plastic zip-tie to secure the
duct to the collar� Pull the insulation and vapor barrier over the duct and tape it to the collar�
IMPORTANT:
The end of the insulation must be sealed to prevent condensation from forming inside the insulation. If a plastic zip-
tie is used to secure the insulation to the hood collar, also tape the end to seal it against condensation problems.
Press the hood against the outside wall and secure in place with screws; seal around the perimeter of the hood with caulk�
INSTALL DUCTWORK
Install 6” diameter flexible, insulated
duct from the round inlet collar of the
unit to the intake hood and from the
oval outlet collar of the unit to the HVAC
system� Duct the outlet of the ventilator
to the
return side
of the HVAC system
(refer to
FIGURE 5
)�
IMPORTANT:
The end of the
insulation must be sealed to prevent
condensation from forming inside
the insulation. If a plastic zip-tie
is used to secure the insulation to
the hood collar, also tape the end
to seal it against condensation
problems.
FILTER
FURNACE/AIR HANDLER
AIR FLOW
FRESH AIR
VENTILATOR
FRESH AIR INTAKE DUCT
FR
ES
H A
IR
OUTSIDE
WALL
FRESH AIR
INTAKE HOOD
WITH
SCREEN
FRESH AIR
INTAKE HOOD
WITH
SCREEN
TYPICAL BASEMENT INSTALLATION
FRESH AIR
VENTILATOR
GABLE END WALL, BAND JOIST, OR PORCH SOFFIT
FR
ES
H A
IR
FRESH AIR INTAKE DUCT
RETURN MIXING BOX
FURNACE/AIR
HANDLER
FILTER
AIR FLOW
TYPICAL ATTIC INSTALLATION
90-2514
FIGURE 5
– DUCTING IN UPFLOW AND HORIZONTAL HVAC SYSTEMS
