5 Steps to Minimize Mold Risk During Prolonged Shutdown
5 Steps to Minimize Mold Risk During and After a Prolonged Shutdown
- Maintain indoor humidity as low as possible, not exceeding 50%, as measured with a humidity meter. Building managers may consider continuous monitoring of indoor humidity using a digital hygrometer, ideally more than once daily, to minimize the need to access the building.
- After a prolonged shutdown and before occupants return, buildings should be assessed for mold and excess moisture.
- After an assessment has confirmed that mold and moisture are not detected, OR after remediation has been completed, a building HVAC system that has not been active during a prolonged shutdown should be operated for at least 48 to 72 hours (known as a “flush out” period) before occupants return.
- After a building is reopened and occupied, routine (e.g., weekly) checks of the HVAC system are recommended to ensure operating efficiency.
- If no routine HVAC operation and maintenance program are in place for the building, one should be developed and implemented.