In residential buildings, what type of fire safety equipment may not be available?

In many residential buildings, especially smaller ones like apartments or single-family homes, portable fire extinguishers may not be required or commonly found. While building codes and regulations often mandate the installation of smoke alarms and exit signs, the presence of portable fire extinguishers is not universally enforced in all residential settings.

This lack of availability can be attributed to the residential context, where owners might not view extinguishers as necessary due to lower perceived risks compared to commercial properties. In contrast, manual pull stations, fire alarms, and exit signs are typically part of comprehensive fire safety measures and are commonly present for both safety and regulatory compliance. Thus, while they might be found in public areas or commercial buildings, they are less likely to be a usual feature in residential setups, making portable fire extinguishers the correct choice for this question.