A noncentral recirculating air-handling system (e.g., a fan coil unit) is installed in a single patient room in a hospital. According to CMC Section 408.2.4, what is the minimum MERV rating required for the filter in this unit, and how must the outdoor air requirements for the room be met?

• MERV 6; outdoor air must be provided by a separate central air-handling system.
• MERV 13; outdoor air can be provided by the same unit if it has an outdoor air intake.
• MERV 11; the unit itself must provide 100% of the required outdoor air changes.
• MERV 8; outdoor air can be provided by transferring air from an adjacent corridor.