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drop-flue
drop-flue adj.
Brit. 
/ˈdrɒpfluː/
, /ˈdrɒpfluː/U.S. /ˈdrɑpˌflu/
of a boiler, in which the flues drop or descend./ˈdrɑpˌflu/ΚΠ
1874 E. H. Knight Pract. Dict. Mech. Drop-flue Boiler..the object being to cause [the heat] to leave the boiler at the lower part, where the feed~water is introduced.
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