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Correct ventilation If the cooker hood is to work correctly there must be an underpressure in the kitchen. It is important to keep the kitchen windows closed and have a window in an adjacent room open. Important to know Not applicable for recirculation. Great care must be taken if the hood is used at the same time as a burner or fireplace (e.g. gas, diesel, coal or wood heaters, water heaters, etc.), as the hood will expel air which is required by these other appliances. Attend to it by opening