Alcosa forge co used to make a patent grit arresster hood and they were very eficiant for use around straw stacks and timber yards untill recantly i had one , the idea was simple the flue was sq with a inverted V that divided it into two sq tubes one down each side of the hood and fitted with a slide out door at the bottom to clear the grit ,and there was some, above the ve baffle the flue opend out to about twice its size for about 1 ft and had another downwards facing baffle that brought the flue back to the original size the idea of the bulge in the flue was to let the gases expand and lose speed letting the grit fall back , it was far more simple than it sounds .
As to the blast you have on it could be a bit stiff ,but some of the forges we ran on big jobs the coke was boiling and the grit up the flues had fire in them ,the arresters did a good job .
This is landing up a essay, the men that ran Cupolas had big troubles and they had to sort it out with baffles and reverse flues ,i have a forge we used for anchor forging and i have made a baffle hood for it ,stand outside your smithy with the hearth at full blast on a dark night and you will know if you need a baffle box .
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