HWD 90 cavity wall boxes for EI30-EI90 fire-protection walls ensure certified and fire-protection compliant electrical installation. Intelligent AFS technology reacts immediately to fire and heat and automatically seals the installation opening. This guarantees the fire resistance class of the fire-protection wall and secures escape routes. Use in all fire-protection walls and the fire-resistance duration of up to 90 minutes ensures maximum flexibility, even when the planning is changed. At the same time, it also maintains the wall's sound insulation requirements. 

• compatible with Feller SNAPFIX®
• For fire-protection walls F30-F90 or EI30-EI90
• Maintains the wall's sound insulation protection
• Retrofitting also possible
• With fire-protection cover, can be used as a junction box
• Also for directly opposing installation
• May not be used inside encapsulated walls