Which of the following cannot be used indoors when not stored in an FDNY approved area?

The correct answer is that portable generators and power washers cannot be used indoors when not stored in an FDNY approved area. This is because both generators and power washers typically run on fuel, which emits harmful fumes, poses a fire hazard, and requires proper ventilation to ensure safety. Using these devices indoors increases the risk of carbon monoxide poisoning and other hazardous situations due to the accumulation of toxic exhaust gases.

In contrast, gasoline, while it is a flammable liquid, is typically stored in approved containers and not used indoors in everyday situations, as it is intended for external use only (e.g., in vehicles or machinery). Scooters and lawn furniture are not hazardous in the same way generators and power washers are, and while they may have storage requirements, they do not produce harmful emissions when stored indoors. Understanding the safe usage and storage of each of these items is crucial for maintaining safety within buildings, particularly in relation to FDNY regulations.