How wide does the cooker hood need to be? This depends firstly on the width of the hob and secondly on the size of your kitchen. It is important for the cooker hood to be slightly wider than the hob below it. Only then can you be certain of capturing all the rising steam and vapours and benefit fully from the cooker hood’s power. If there is not enough space for this, then the cooker hood should be at least as wide as the hob. The width of the canopy on many Miele cooker hoods can be made to measure to suit your requirements.