Abstract: The present invention is directed generically to a closure for a portal within a structure, and more specifically, to a closure such as a sectional-type door, comprising plural door panels wherein one or more door panels can be operated independently of the remaining door panels and thereby the ingress point may be only partially occluded. Presently, sectional-type doors are used to block ingress/egress into permanent structures such as commercial and residential garages, and on a reduced scale, to block ingress/egress into mobile structures such as panel vans and storage containers. Heretofore, sectional-type doors have typically been employed wherein the sectional door traverse tracks located on either side of a portal as a linked series of door panels.