Armstrong Commercial Ceilings (MetalWorks™) : F-plank aluminum 300x3000x0.7mm. Non Perforated (RAL7039), F-plank aluminum 300x3000x0.7mm. Non Perforated (13Mw0007), F-plank AL 300x3000x0.7mm. Non Perforated, F-plank AL 300x3000x0.7mm. Micro- Perforated (RAL7039) Total : 1,940 Sq.m.