What type of vestibule is required for the connection of a parking garage to a room with a fuel fired appliance?

A two-doorway separation is required for the connection of a parking garage to a room containing a fuel-fired appliance due to the need for enhancing safety and minimizing the potential for hazardous gases entering the appliance area. The rationale behind this requirement is to create a physical barrier that limits exposure to carbon monoxide and other harmful fumes that can accumulate in parking garages. This design also helps maintain a controlled environment for the fuel-fired appliance, ensuring better performance and safety measures are in place.

In scenarios where fuel-fired appliances are involved, the two-doorway vestibule acts as an additional layer of protection, allowing for better ventilation and reducing risks associated with flammable gases. The proper installation of such vestibules in alignment with the North Carolina Mechanical Code ensures compliance with safety standards that protect both the occupants of the building and the equipment.