Bosch Ventilation. Stylish and quiet. Three chimney-style wall hoods and downdraft units round out this line of beautiful ventilation products from Bosch. Choose from a variety of styles - from traditional to contemporary. They are available in 30 and 36 inch sizes, and colors include stainless steel, black and white, so you can match them with your Bosch cooktop. Their efficient performance quickly removes steam, odors and smoke generated from cooking. And they feature multiple-seed fans that are remarkably quiet. The style of these ventilation products enhances the rest of your Bosch major appliances, giving you a beautifully integrated look.