Patent ID: 7007980

Claim:
A duct connection assemble comprising: a joint duct having a branch duct and a saddle flange formed on a lower portion of said branch duct; a main ribbed duct having an upper side opening and a plurality of ribs formed around said upper side opening; a rubber sealant having streaks of rib-fitting grooves to be fit into said ribs, and having a communication hole which is to be communicated with said upper side opening; a plurality of recesses provided on an upper surface of said rubber sealant to be positioned between said rib-fitting grooves; a plurality of protuberances provided on a lower surface of said saddle flange to be fit into said recesses; a plurality of water sealing small projective rings provided on a lower surface of said rubber sealant in correspondence to said recesses to concentrically surround said communication hole; whereby upon connecting said saddle flange of said joint duct to said main ribbed duct through said communication hole, said rubber sealant is interposed between said saddle flange and a circumferential area of said communication hole so that said protuberances uniformly press said rubber sealant substantially through said recesses to tightly engage said saddle flange against an outer surface of said main ribbed duct through said rib-fitting grooves and said water sealing small projective rings.