How must cylinders at a location open to the public be protected?

Cylinders at a location open to the public must be protected in a lockable ventilated enclosure of metal to ensure both safety and security. This requirement is rooted in the need to prevent unauthorized access to potentially hazardous materials, like liquefied petroleum gas (LPG) cylinders.

A metal enclosure is preferable because it provides a robust barrier against tampering, theft, or accidental misuse, which is crucial in public spaces where individuals may not be aware of the associated risks of LPG. Additionally, proper ventilation in the enclosure is critical as it helps dissipate any gas that could escape, thereby reducing the risk of fire or explosion in the event of a leak.

The choice of a lockable enclosure serves to regulate access, ensuring that only trained personnel can handle the cylinders. This aligns with safety principles that prioritize protecting not only the materials themselves but also the safety of the public nearby.