(57) A delivery nozzle (10) for application to pumping apparatus for mineral fibre at
least when used as insulation comprises a body member (10) that substantially reduces
in cross-section between an input part (12) of a first constant cross-section, e.g.
50 mm circular, and an exit part (15) of a second constant cross-section, e.g. 22
mm circular. The exit part (15) is vented at a cross-section less than the first cross-section
of the body member. The venting (31) comprises a branch (32), which is directed forwardly
and downwardly of the nozzle, and a gate valve 40 capable of adjustably varying the
effective orifice of the venting. The venting is arranged substantially parallel to
a cut-off (30) of an end portion of the nozzle.
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