The Mystery of Flue Sizing Rumford
>Problem is most brick these days and all block are modular that is the units are less than 4" or 8" or 16" but lay up, with a mortar joint, to these dimensions. If you try to wrap a standard 13" flue with modular brick or block you either end up with one inch head joints, cut little slivers of brick or block or, more likely, build the ...