NFPA-99 Practice Exam

Wooden racks for cylinder storage are no longer permitted primarily due to safety concerns related to fire hazards. Wood is a combustible material, and in environments where gases are stored — such as medical or industrial gases — the risk of a fire can significantly increase if wooden structures are involved.

The National Fire Protection Association (NFPA) standards emphasize the importance of minimizing risks associated with fire and ensure that cylinder storage areas are constructed in a way that enhances safety. This is why the move towards non-combustible materials for racks in storage areas has been implemented, as it aligns with creating safer environments for both personnel and property.

Therefore, the statement that wooden racks are no longer permitted reflects an adherence to modern safety standards aimed at preventing incidents related to fire hazards in cylinder storage.