Grille Box GB:
Product / Duct Dia / Square / Cat number
GB20/100 100mm/200mm / Ref. 89676AA
GB20/125 125mm/200mm / Ref. 89677AA
GB20/150 150mm/200mm / Ref. 89678AA
GB30/200 200mm/300mm / Ref. 89679AA
GB30/250 250mm/300mm / Ref. 89680AA
GB45/315 315mm/450mm / Ref. 89681AA
GB50/315 315mm/500mm / Ref. 89828AA
GB60/315 315mm/600mm / Ref. 90296AA

• Used in conjunction with egg-crate ceiling grille and ceiling diffuser grille to connect to ductwork
  
• Use Xflex FD or TFD to attach to spigot and secure with worm drive dip

• Data tables
• Spares