Patent ID: 6244633
Filing Date: 2001-06-12
Classification: F16L,F24F

Abstract:
A collar for connecting a duct to a wall having a hole therein bounded by an edge having a predetermined thickness, said collar comprising:sheet of material having top, bottom, left and right edges, said sheet forming tubular structures when said left and right edges overlap, said sheet comprising a groove for engaging said edge of said hole, said groove being present when said collar is not engaged with said edge of said hole and said sheet further comprising first and second detents spaced apart on said sheet, said overlap of said left and right edges at said top edge changing when said spacing between said first and second detents is changed said groove being located proximate to said top edge:a first fastener for fixing said overlap of said left and right edges at said top edge when said edge of said hole is engaged in said groove, said overlap being selectable from a plurality of overlap positions; anda second fastener for fixing said overlap of said left and right edges at said bottom edge.