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Pre-Installation (continued)
6 . Adjust old duct work or install new duct work, as necessary, by
following these guidelines:
- Your venting system must vent to the outdoors either
horizontally through the back wall (4) or vertically through
the roof (5) .
- A straight, short duct run will allow the hood to perform most
efficiently. Long duct runs with elbows and transitions will
reduce the performance of the range hood . Use as few of
them as possible .
- Use round metal duct work with a uniform diameter of
6 in . (152 mm) . Larger ducting may be required for best
performance with longer duct runs .
- Before making cuts, make sure there is proper clearance
within the ceiling or wall for the exhaust vent.
- Fasten all connections between pieces of duct with sheet
metal screws and tape all joints with certified duct tape.
- Cap the exterior of the duct with a wall cap (6) or roof
cap (7) .
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