Abstract: A seal set for flexible duct connector is provided. The invention is a seal assembly for a connector of flexible duct, comprising an activation flange having a contact area acting against an activation area in a seal means due to tightening of screws so as to press such seal means against a support area. According to the invention, the seal assembly comprises a support flange in which is such support zone. Thus, in case of need of an adjustment machining in the support area to assemble a seal assembly, the part to be machined is the support flange.