Coal and coke - whether to wash / sieve ?

Assuming a duck's nest hearth burning coke, do many smiths bother to sieve or wash their coke to remove the fines ? Last time I was using
a coke hearth it was full of very dusty coke and I had a lot of trouble with clinker.
From what I've heard, coke is rare in the USA and solid fuel means coal. Is coal any better for clinkering from dust ?
-- Die Gotterspammerung - Junkmail of the Gods
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