Yeah I control my Egg with the bottom vent just like my WSM. I find the Egg is even easier to lock and hold temp. Say I want to cook at 250 I will have the bottom vent wide open to about 200 then close it till it is only about an inch open and then watch it climb up slowly and then keep nudging it closed as the temp gets closer to 250. The bottom vent may only be open a quarter of an inch or so once locked in. I have the XL so the mileage may vary on another size, but you get the idea.
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