Which factor is NOT essential for the effectiveness of a sprinkler system?

The effectiveness of a sprinkler system significantly depends on several critical factors, and placement of decorative features around the system does not influence its functionality or performance. For a sprinkler system to operate effectively, it is vital to have an adequate water supply to provide the necessary pressure and volume for extinguishing fires. Regular maintenance and inspections ensure that the system is in working order and free of obstructions or failures. Additionally, proper installation according to regulations and standards guarantees that the system will perform as intended when needed. Therefore, while decorative features may enhance the aesthetic appeal of a space, they do not play a role in the operational effectiveness of the sprinkler system.