As part of the district’s School Site Specific Protection Plan (SSSPP) for a return to in-person instruction, the district conducted an assessment for all heating and ventilation (HVAC)
equipment at all campuses throughout the Mill Valley School District. Our existing HVAC systems were evaluated to:

• Ensure our current systems comply with recommended state and local codes and
  recommendations from the Centers for Disease Control and Prevention (CDC)
• Ensure the appropriate amount of outside air is delivered to each instructional or office
  space.

As a result, we are confident that all measures we are taking will ensure the health and safety of
our students.

• Building and classroom exterior windows and doors will be opened as practicable to
  allow for outside air ventilation. Fresh air will be brought into the building through the
  HVAC system and/or teachers will be encouraged to keep all windows and doors open in
  order to maximize the flow of fresh air.
• Minimum efficiency reporting value (MERV)-13 air filters have been installed on all of our
  HVAC units.
• High-efficiency particular air (HEPA) air purifiers have been purchased for each
  classroom.