What type of separation is required when connecting a parking garage with any room containing a fuel-fired appliance?

When connecting a parking garage to any room that contains a fuel-fired appliance, a two-doorway separation is required to ensure a proper barrier against the potential hazards associated with fuel combustion. This requirement is crucial for maintaining safety in environments where flammable gases and exhaust emissions may be present.

The two-doorway separation serves several purposes: it helps to limit the transfer of gases and maintain the integrity of both spaces by acting as a buffer zone. In the event of a malfunction or leak in the fuel-fired appliance, this separation significantly reduces the risk of combustion products entering the parking garage area, where they could create a hazardous environment.

It's important to note that the specifics of the separation requirements may vary based on the building's design and local codes, but the general standard is to include this level of separation to enhance safety measures in buildings. In summary, the two-doorway separation is a proactive approach to fire safety and hazard mitigation in spaces where fuel-fired appliances are present.