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Low Draft? .02 draft at breach
I have a 65 year old Sears & Roebuck Oil fired Hot Water boiler. Model # 204 419. I ran the boiler for 10 minutes and then checked the draft at the breach with Bacharach Mzf draft gauge and the best I can get is .02.
From everything I have read .02 is low, shouldn't the draft be .04 to .06. ?
Just had the chimney cleaned, it is unlined brick. I cleaned out the smoke pipe myself after my oil company did a marginal job of brushing out the heat exchanger. The oil company did not want to open the fire box, said it was too old. When the boiler had cooled off I stuck a vacuum in the fire box and got some soot and debris but most of it seems baked on and rock hard.
It has a brand new Fields Controls draft damper, but the damper is located in a bull head tee, which the Fields Controls does not recommend for oil fired burners, could this be why I am getting such a low draft reading?
Thanks - Jud