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My gas hydronic boiler is designed (or just specified) to require a draft hood and a damper on its 6" flue. My question is, on a level lower that going by the dictates of the spec, how much less of ventilation would be if the 6" exhaust opening on the appliance were direct piped to the 6" chimney stack without a draft hood and a damper? My previous boiler did not use a draft hood and the damper was broken so that was effectively what I am asking for. Or is the draft hood + damper requirement specific to the model of the appliance, some require it and some don't?

Concretely, I would like to at least test this appliance exhausting into the chimney stack directly (until the two parts arrive, which I have to order). Would that be a carbon monoxide or similar hazard?

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