One two inch exhaust or the equivalent area in smaller holes works well. One hole is easier to manage for choking up the barrel when you are finished smoking.
Most people are going to a single large intake controled or covered with either a sheet magnet, BGE stainless intake or a metal flap. This works better than multiple holes, easier to control and allows easier cleaning of the ashes. I use a 2" intake as this allows me to smoke at 180 or bake pizza at 550. An intake hole can be too small but not too large(within reason). It is the amount of opening that matters and there is no benefit to having the intakes spread around the barrel. Even at wide open my fire does not burn towards the intake hole but burns toward the available lump. Its the hottest lump that is going to catch- not the lump nearest the door!
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