JR,
Sorry for the late reply. Things got busy for me yesterday, then there were errands and appointments today. I had a little problem understanding your last drawing. And I may be my misunderstanding the size of the anchor plate. Regardless, I agree that 7" to 8" would be fairly easy to transition. Back, a page or two ago, I was thinking that you were contemplating a (1 brick) 9" depth entry. That would have made the opening (front to back) some where in the 4 to 5" range. That would have been a different ball game . With a (brick and a half) 13.5" depth entry, you should have plenty of room for a full 8" opening. A full 8" opening leaves 5.5". That's 2.75" each (front and back) to complete the entry arch and form the entry to flu opening. It can be done with a 12" (brick and a half) depth entry imo.
If I'm missing something, please correct me .
Sorry for the late reply. Things got busy for me yesterday, then there were errands and appointments today. I had a little problem understanding your last drawing. And I may be my misunderstanding the size of the anchor plate. Regardless, I agree that 7" to 8" would be fairly easy to transition. Back, a page or two ago, I was thinking that you were contemplating a (1 brick) 9" depth entry. That would have made the opening (front to back) some where in the 4 to 5" range. That would have been a different ball game . With a (brick and a half) 13.5" depth entry, you should have plenty of room for a full 8" opening. A full 8" opening leaves 5.5". That's 2.75" each (front and back) to complete the entry arch and form the entry to flu opening. It can be done with a 12" (brick and a half) depth entry imo.
If I'm missing something, please correct me .
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