... Different types: Single slopedouble slopeSing spandouble-spanMulti-spansingle floor, double floors3) Different Bases: Cement and steel foundation bolts4) ... rolling door(within 15m2) Window Alu. Alloy (can use with skylight) Usage Warehouse, workshop, shopping mall, exhibition ... rolling door (within 15m2) Window Alu. Alloy (can use with skylight) Usage Warehouse, workshop, shopping mall, exhibition ...