Patented twin, independent-axel running carriage with polyamide rollers provide smooth operation on top-mounted systems and no "flat tire" effect if doors remain closed for long periods.

Special dual stainless steel runners and tracks for floor mounted systems prevent wear and tear and are not affected by debris in the track.

Build in adjustment and compensation points insure continued ease of operation if building settling occurs.

Concealed hinges ride in a secure track on the spine of wood panels provide full adjustability and overall sytstem stability. Note the double gaskets for weather resistant comfort.