(57) Flue head-piece for airing and venting ducts, formed by two single pieces and in
particular by a first bottom piece (A) with a bush (1, 1') designed at the bottom
for connection to the venting duct (E) and designed at the top for rapid and if necessary
releasable connection, for example by means of snap engagement, to the second top
piece (C) which comprises a collar (9) provided as one piece with lugs (10, 110) directed
upwards and integral with the covering cap (11), the said two pieces (A, C) being
designed in any way so that between them there may be removably housed an optional
third piece (B) consisting of a disk-shaped screen for protection against the entry
of insects or other small foreign bodies.
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