Because there are no capacity limits, it's preferable to seek for size standards instead. Although most people consider 6 quarts to be the sweet spot, there are several air fryers with smaller capacity that can still feed a big household. I recommend sticking to the considerably bigger capacity devices I assess if you're cooking for 6 or more people. Some models have up to 20 quarts of internal cooking space. All that matters is that you purchase in accordance with your requirements.