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Hi,
A general comment about inside vs outside blocks:
I have noticed a (small) difference between taping (the outside) in courses starting at the bottom of the grill vs starting at the top. The only difference is the direction of the overlap -- the air is catching and lifting the seam if you start at the bottom, and this then drags a bit more!
So, if that small detail makes a difference, then blocking the inside of the grill can't be as effective as blocking the outside.
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