Should I clean my ceiling plenum?

Yes. Drop Ceilings (or acoustical ceilings) are one of the main causes of fallout contamination and should be cleaned at least once per year. Fallout contamination becomes airborne and can infiltrate sensitive air-cooled equipment. Drop ceilings move slightly from pressure changes in the room – for example when someone opens a door to the data center the pressure changes and some ceiling tiles may shift slightly – causing particle fallout.