In a building with 500 sprinkler heads, how many extra heads must be maintained as spares?

In a building with sprinkler systems, it is essential to maintain a certain number of spare sprinkler heads to ensure compliance with safety regulations and to facilitate the rapid replacement of any malfunctioning or damaged heads. According to NFPA (National Fire Protection Association) standards, for a system with 500 or more sprinkler heads, the requirement is to keep at least 12 spare heads on hand. This is to provide adequate resources for maintenance and replacement without disrupting the fire protection system. Having these spare heads readily available helps ensure that the system remains operational and effective, which is crucial for the safety of the building's occupants and for fire protection measures. Therefore, the requirement for having twelve spare sprinkler heads reflects a commitment to maintaining fire safety standards in larger buildings.