Fire protection ceiling bulkhead for ER exhaust air systems. With a continuous free cross-section and smooth inner surfaces. General building approval, approval number Z-41.3-556. Approval notice at www.maico-ventilatoren.com. Fire resistance class K90-18017. Maintenance-free. Article: TS 18 DN 125, Air direction: Ventilation, Installation location: Ceiling, Installation type: Flush-mounted, Material: Sheet steel, Weight: 1.27 kg, Weight with packaging: 1.31 kg, Fire protection: yes, Suitable for nominal width: 125 mm, Width: 256 mm, Height: 162 mm, Depth: 156 mm, Width with packaging: 257 mm, Height with packaging: 163 mm, Depth with packaging: 160 mm, Approval number: Z-41.3-556