What type of containers must NOT be stored or used indoors in certain occupancies?

Portable LPG (liquefied petroleum gas) and CNG (compressed natural gas) containers must not be stored or used indoors in certain occupancies due to the inherent risks associated with these gases. Both LPG and CNG are highly flammable and can form explosive mixtures with air, creating a significant fire hazard if leaks occur. Storing these containers indoors increases the risk of gas accumulation in confined spaces, which can lead to dangerous situations such as explosions or fires.

Furthermore, regulations and safety standards often dictate strict guidelines for the handling of hazardous materials, including the prohibition of gas containers in indoor settings, especially in areas where there is a high density of people or sensitive operations taking place. By ensuring these containers are stored outdoors, the risk to human life and property is minimized, allowing for safe operations and compliance with safety codes.