<P> A typical version of an overhead garage door used in the past would have been built as a one - piece panel . The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism . Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers . The weight of the door may be 400 lb ( 181.4 kg ) or more , but is balanced by either a torsion spring system or a pair of extension springs . A remote controlled motorized mechanism for opening garage doors adds convenience , safety , and security . </P>
<P> A typical version of an overhead garage door used in the past would have been built as a one - piece panel . The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism . Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers . The weight of the door may be 400 lb ( 181.4 kg ) or more , but is balanced by either a torsion spring system or a pair of extension springs . A remote controlled motorized mechanism for opening garage doors adds convenience , safety , and security . </P>
what is the weight of a garage door
what is the weight of a garage door
400 lb ( 181.4 kg ) or more
400 lb ( 181.4 kg ) or more