How Do I Troubleshoot Zephyr Range Hoods?
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Close windows and doors near the range hood. The outside wind flow affects ventilation.
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Remove blockage in the duct work or duct opening. Adjust the direction of the duct opening if it is against the wind.
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Adjust the range hood so that it is between 24 and 32 inches from the cooktop. Reinstall the hood at the correct height.