The ceiling vent changes how heat behaves inside the oven. If it’s open, heat escapes straight up the chimney. If it’s closed, it allows heat and
smoke to gather at the top of the oven chamber until they escape through the side air channels.
Ceiling vent: When this is
closed, it will reduce air flow and
allows hot air to gather inside
the oven for longer.
Side air channels: These allow
hot air to escape when the
chimney vent is open and ceiling
vent is closed.
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