Mike,

Not familar with cement flue blocks myself. I knew that they didn't appear to be typical CMU's.

As far as the openings, what if they had been sealed off on the ends with mortar, would they then be acceptable.

Just being cement flue blocks as you mentioned, they are probably not designed for such use on a foundation wall to begin with. (?)

Rick

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Rick Hurst_Home Works Inspection Co_Rockwall TX
In the words of Mike Tyson.... "Everyone has a plan until they get hit inda mouf"