Manufacturers Specification for Open Cell Ceiling System. Open Cell Ceiling C50 / C75 / C100 / C150 / C200 MAIN & CROSS RUNNER: Supersil make U shaped profile, 10 mm wide x 50 mm deep with inwardly return edge of 2.5mm formed out of 0.50 mm thick (TCT) Aluminum Alloy AA 8011 fixemore...