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DUCTING This style of range must be vented via ducting to the outside of the house. Follow general rules when ducting the hood: Use correct size of ducting (6" or 7” round ), do not reduce size of ducting, make all turns gradual, no short corners. If ducting ran will be longer than 10 feet enlarge duct by at least 1" inch diameter after each 10 feet. Tape all joints in ducting and all gasketed openings on hood for a tight seal. For round ducting from the top: For the gray plastic (included) over