| 摘要 |
<p>An extruded duct unit (1 ) of channel shape in cross section is provided that is adapted to cooperate with an identical duct unit to form a closed duct therewith. The duct unit has at least one integral longitudinally extending attachment formation (4) configured to hold captive relative to the duct unit a plurality of complementary clamp elements (5) adapted to operatively encircle a composite duct and hold the two constituent duct units in their duct defining relationship. The clamp elements have a pair of cooperating integral catch formations (8, 9) whereby a pair of clamp elements can be clipped together to form an operatively substantially endless clamp encircling a closed duct and an integral outwardly directed circumferential terminal flange (12) at each axial end thereof. Generally semicircular clip units are provided to connect the terminal flanges (12) associated with the ends of collinear duct assemblies. The duct units and clamp elements are preferably formed into subassemblies thereof.</p> |
