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Ahhh ok so it's not very well metered. The flue staying hot is very important.
Most waste oil systems use metered compressed air and a suction nozzle, plus a fan from a heating fuel unit. This way the air is metered very precisely and it is less sensitive to a marginal draft. They usually run 3%-5% excess air and are able to do it regardless of outside barometric pressure.
Drawing in outside air exclusively for combustion is a good idea.
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