Flue bridge

the separating low wall between the flues and the laboratory of a reverberatory furnace.

See also: Flue

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Today's picture, above, shows, through the Flue Bridge in Stephenson Street, Willington, the old Stephenson Memorial School that stood on the site where Stephenson's Cottage once stood.