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Control the temperature

The draft door and the rEGGulator

Open is hotter, closed is cooler. From BGE US and BGE Europe.

Set the draft door first: BGE Europe says it sets the upper limit.
Fine-tune with the rEGGulator's disc (BGE Europe).
Keep the two in step: "if your cap is open 1 in/2.5 cm your door should be too" (BGE US).
Make small changes and wait until the temperature has stopped moving (BGE US).
To bring it down, close both a little at a time. Ceramic holds heat, so creep up rather than overshoot.

Vent settings by temperature

BGE Europe's 2026 cheat sheet, drawn for the rEGGulator (read from pictures, so approximate):

100 °C: draft door about a quarter open, rEGGulator nearly closed.
150 °C: door about a third, rEGGulator slightly open.
200 °C: door about half, rEGGulator more open.
350 °C: both fully open.

BGE US rates the EGG from 93 to 399 °C (200 to 750 °F). BGE Europe advises keeping cooking below 300 °C to spare the felt and hinge; see the limits.