Yeah, the dome itself is usually built and designed around the entry and vent location / design already in mind. What's critical is the ratio of the dome ceiling height to the dome entry height. Hot exhaust gas first exits out the entry and then rises up and out into the vent and flue.
You can basically build a dome with a simple entry and no vent. Fresh air enters through the lower area of the entry while the hot gases exhausts out through the upper portion of the entry. You can singe your eyebrows if get too close to the entry though...
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