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If using 6'' (150 mm) round ducts, use a transition. Use 2'' (50 mm) metal foil duct tape to seal joints. 2. MEASURE THE INSTALLATION Dimensions for the most common installations are shown below. We recommend to install the hood at a minimum of 20” (508 mm) from an electric range and at 24” (610 mm) from a gas range. For optimal performance, the hood should not be installed more than 30” (762 mm) from cooktop. - 4 - 3. PREPARE THE INSTALLATION Make sure the following items are included: