Under what condition is a single door permitted for connecting a parking garage to a fuel fired appliance room?

A single door is permitted for connecting a parking garage to a fuel-fired appliance room when the sources of ignition are elevated. This condition is important because it allows for an adequate safety measure in scenarios where the risk of ignition is higher due to the presence of fuel sources, such as in a parking garage where vehicles may be running.

The rationale behind this provision is that by having the sources of ignition elevated, there is less likelihood of ignition sources being in close proximity to any fuel that could leak or accumulate, thereby reducing the risk of fire. The codes are designed to prioritize safety and ensure that there is a lower chance of accidental ignition from typical sources found in these environments.

In contrast to other conditions presented, the requirement regarding elevated sources of ignition specifically addresses the immediate risks associated with the unique characteristics of the space in question, ensuring a more targeted and effective approach to fire safety regulations.