A kit for the assembly of a main door comprises at least two fixed uprights and at least one fixed crossbeam, associable with each other to define a fixed frame that can be attached to an access opening of a compartment, wherein the access opening has relevant reference dimensions; at least two movable uprights and a plurality of panels, associable with the movable uprights to define a movable leaf; a movement device/structure/component/element/unit/apparatus, associable between the movable uprights and the fixed frame; where at least one of the fixed uprights, the fixed crossbeam and the movable uprights is made according to respective predefined standard dimensions, which are bigger than the reference dimensions, and comprises at least one related trimmable portion, provided with at least one graduated reference scale adapted to allow the cutting of the trimmable portion depending on the reference dimensions.

A light assembly for use with a garage door operator (GDO) convertible between a ceiling mounted configuration and a jackshaft configuration may be provided. The light assembly may include a first illumination member and local and remote light housings to which the first illumination member may be independently removably operably coupleable. The first illumination member may be operable between an illuminated state in which it may illuminate an area and a non-illuminated state in which it may not illuminate the area. The local light housing may have a first power source and may be disposed at a main housing of a motorhead of the GDO. The remote light housing may have a second power source and may be disposed away from the main housing. The first illumination member may be operably coupled to one of the local light housing and the remote light housing at a time.

A GDO conversion assembly for transitioning between a ceiling mounted and a jackshaft configuration includes a motorhead having a motor output shaft extending from a motorhead casing that includes a mounting interface disposed proximate to the motor output shaft, a track assembly including an input interface shaped to mate with the mounting interface to operably couple the motorhead to a sectional garage door, and a transmission assembly including an input coupler shaped to mate with the mounting interface to operably couple the motorhead to the sectional garage door. The transmission assembly includes an output coupler to operably couple the transmission assembly to a drive tube rotatable to alternately open and close the sectional door. The output coupler includes an output pinion. The input coupler includes an input pinion operably coupled to the output pinion via a flexible coupling member. The transmission assembly includes a transmission housing and a coupling bracket.