How wide does the ventilation hood need to be? This depends firstly on the width of the cooktop and secondly on the size of your kitchen. It is important for the ventilation hood to be slightly wider than the cooktop below it. Only then can you be certain of capturing all the rising steam and cooking vapors and benefit fully from the ventilation hood's power. If there is not enough space for this, then the ventilation hood should be at least as wide as the cooktop. The width of the canopy on many Miele Ventilation Hoods can be made to measure to suit your requirements. Non-standard widths of up to 87 in (220 cm) are possible for many models.