A sectional door, comprising: - a frame , - a door which is divided into an upper section and a lower section , wherein each section comprises one or more panels, - one or more coupling units configured to couple or uncouple said upper section of the door from said lower section of the door , and - an actuator configured to move the door , characterised in that said one or more coupling units comprise: - a first housing attached to a lower end of the upper section of the door , - a second housing attached to an upper end of the lower section of the door and - at least one coupling mechanism comprising: ∘ an elongated appendix having a base portion fastened to the second housing , an intermediate portion and a thickened end portion , distal and opposite said base portion , wherein said thickened end portion is wider than said intermediate portion and wherein the base portion is wider than the thickened end portion , and ∘ a clamping connector fastened to the first housing including an adjustable opening with an interior chamber suitable for receiving, inserted, said elongated appendix and at least one retaining device movable between an initial standby position , a final standby position and one or more intermediate positions , wherein in a coupling configuration, the elongated appendix is partially inside said interior chamber of the clamping connector and said at least one retaining device transitions from said initial standby position to a first intermediate position and then back to said initial standby position , adjacent to a wall of the intermediate portion of the elongated appendix , clamping the thickened end portion , wherein in an uncoupling configuration, the elongated appendix is inside said interior chamber of the clamping connector and said at least one retaining device transitions from said initial standby position to said final standby position allowing the elongated appendix to be removed from inside the clamping connector , and wherein said at least one retaining device returns to said initial standby position when the elongated appendix is removed. - a frame , - a door which is divided into an upper section and a lower section , wherein each section comprises one or more panels, - one or more coupling units configured to couple or uncouple said upper section of the door from said lower section of the door , and - an actuator configured to move the door , - a first housing attached to a lower end of the upper section of the door , - a second housing attached to an upper end of the lower section of the door and - at least one coupling mechanism comprising: ∘ an elongated appendix having a base portion fastened to the second housing , an intermediate portion and a thickened end portion , distal and opposite said base portion , wherein said thickened end portion is wider than said intermediate portion and wherein the base portion is wider than the thickened end portion , and ∘ a clamping connector fastened to the first housing including an adjustable opening with an interior chamber suitable for receiving, inserted, said elongated appendix and at least one retaining device movable between an initial standby position , a final standby position and one or more intermediate positions , ∘ an elongated appendix having a base portion fastened to the second housing , an intermediate portion and a thickened end portion , distal and opposite said base portion , wherein said thickened end portion is wider than said intermediate portion and wherein the base portion is wider than the thickened end portion , and ∘ a clamping connector fastened to the first housing including an adjustable opening with an interior chamber suitable for receiving, inserted, said elongated appendix and at least one retaining device movable between an initial standby position , a final standby position and one or more intermediate positions , <EOS>