What must not be obstructed when nesting cylinders at a seller's warehouse?

When nesting cylinders at a seller's warehouse, it is critical that egress is not obstructed. Egress refers to the pathways that allow for safe exit from a building or warehouse in case of emergency. Ensuring clear egress routes is essential for safety, as it allows individuals to evacuate quickly in the event of a fire, leak, or other hazardous situations.

Obstructing egress could put lives at risk, as individuals may not be able to exit the area promptly if pathways are blocked by cylinders. This principle is a fundamental aspect of safety regulations and fire codes, which place a strong emphasis on maintaining clear exits to protect personnel and prevent injury during emergencies. Thus, the integrity of egress routes is paramount in warehouse environments where flammable materials, such as fuel-oil cylinders, are stored.