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    premix and co levels

    can anyone explain why premix produces more co? valliant lists 250ppm of co as acceptable!!!
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    co on roomsealed boilers

    hello there just a curious question. seems like a alot of chaps here know their stuff. i left the navy and got my first gas service job last month. downloadedn the hse co incidents report. read that an average of one person a year dies from co from wall mounted room sealed boilers since the mid...