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Installation could be the problem: Your hood was designed to SMOKE/STEAM/ meet specific ducting requirements. If your duct length exceeds ODORS ADEQUATELY the manufacturer's requirements, hood performance will suffer. Air-flow will also be reduced if the house duct work is too small or there are too many elbows in the system. Contact your installer or builder. 2. Obstruction in duct work could be the problem: Make sure nothing is blocking the vent (bird nests or kinks in the duct work). 3. Dampe