Recessed fan and vent sleeves from Aico's Firecap CFS100 series have been designed to restore the fire ratings of ceilings penetrated by recessed ceiling fans and ventilation ducts. The sleeve restores fire integrity of 30 or 60-minute fire rated ceilings, and have been tested to BS476 Part 21. In a fire event, it expands internally to crush the spigot of the fan or vent.