Hardwood bi folding doors can be supplied with a flush track which provides an out of sight track system and flush floor levels. There are many other threshold options available but the four most requested types are shown below.
Stainless Steel Rollers
Stainless steel rollers are concealed within the aluminium top and bottom tracks providing effortless operation of the door.
Track System Dimensions
Image shows flush track arrangement but dimensions remain constant regardless of threshold and track option selected.
This image shows the roller hinge carriage and aluminium track. Note that some gaskets have been removed for clarity.