Some cooks are attracted to the look, control, and capacity of commercial appliances. Truly commercial ranges are not usually allowed in residential applications, however, because of their excessive heat output. When commercial units are allowed, commercial building codes apply, often including overhead sprinklers, extra ventilation, and fire stops. A few manufacturers have adapted the best features of commercial appliances to residential dimensions, weights, and heat clearances. If gourmet cooking is your passion, these offer the best of both worlds, but at a price.
Cooking creates a lot of steam, heat, smoke, and atomized grease, which are best vented outdoors.
Gas appliances also produce exhaust gases, which should be expelled. When possible, avoid vent hoods that do not vent outdoors, since they are primarily grease catchers. When shopping for a vent hood, focus on capacity and power.