SPECIAL INSTRUCTIONS: When using your Velo or Velo Pro HEPA Attachment for water damage restoration, mold remediation, or other conditions where dangerous contaminants may be present, both the HEPA filter (F519) and the Prefilter (F520) should be replaced after each job to help prevent cross-contamination. Before installing new filters, vacuum and damp wipe top plate and wire frame according to current ANSI/IICRC standards for remediation. Remove filters and clean unit before removing it from the containment area to avoid cross-contamination. Allow the unit to dry before installing clean filters.