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9
3.3.3 Hoods
Refer to applicable building codes to plan where the stale air exhaust hood and fresh air distribution hood should be
installed. Below are some general recommendations.
• There must be a minimum distance of 10' between the hoods to avoid cross-contamination.
• Hoods must be at least 18" above the ground.
• Exhaust hood must have a backdraft damper.
WARNING
Make sure the intake hood is at least 6 feet away from any of the following:
• Dryer exhaust, high ef ciency furnace vent, central vacuum vent
• Gas meter exhaust, gas barbecue-grill
• Any exhaust from a combustion source
• Garbage bin and any other source of contamination
!
3 Installation (cont'd)
3.3 Installing the Registers, Ductwork and Hoods (cont'd)
3.4 Installing a Tandem
®
Transition* Kit
If desired, a Tandem transition kit can be used instead of 2 exterior hoods.
• An additional backdraft damper (not included) must be installed on the stale air to
outdoors duct following common best practice. Should the backdraft damper cause
an interruption in the insulation of the stale air to outdoors duct, make sure that
insulation is added around the backdraft damper to avoid condensation.
• The joist opening needed to install the Tandem
®
transition must be 9¾” minimum.
The maximum height of the Tandem transition is 8¾”.
• To connect the insulated exible ducts to the Tandem transition (Exhaust air to
outdoors and Fresh air from outdoors), follow the instructions included with the
Tandem transition kit (part no. VTYIK1).
*Patented.
VR0003
Tandem transition kit
CAUTION
If using a Tandem Transition, a backdraft damper must be installed on the stale air to outdoors duct. If this causes an
interruption in the duct insulation, insulation must be added around the backdraft damper to avoid condensation.
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