Vertically Tracked One Piece 'Canopy' Door
One third of the door protrudes from the frame
when open hence the name 'canopy door'
This type of door normally has an overhead spring that supports the door by wire cables connected to rollers that run up & down vertical tracks behind the door-frame uprights, some earlier examples had weights. Garador steel-framed canopy doors have their springs concealed inside the hollow uprights of the steel door-frame.
(see Garador type 'F')
The various options for adding the convenience of remote control
to this type of door are detailed below :-