3.5 Level V: Remediation of HVAC Systems

3.5.1 A Small Isolated Area of Contamination (<10 square feet) in the HVAC System

 

1. Remediation can be conducted by regular building maintenance staff. Such persons should receive training on proper clean up methods, personal protection, and potential health hazards. This training can be performed as part of a program to comply with the requirements of the OSHA Hazard Communication Standard (29 CFR 1910.1200).
   
    
2. Respiratory protection (e.g., N95 disposable respirator), in accordance with the OSHA respiratory protection standard (29 CFR 1910.134), is recommended. Gloves and eye protection should be worn.
   
    
3. The HVAC system should be shut down prior to any remedial activities.
   
    
4. The work area should be covered with a plastic sheet(s) and sealed with tape before remediation, to contain dust/debris.
   
    
5. Dust suppression methods, such as misting (not soaking) surfaces prior to remediation, are recommended.
   
    
6. Growth supporting materials that are contaminated, such as the paper on the insulation of interior lined ducts and filters, should be removed. Other contaminated materials that cannot be cleaned should be removed in sealed plastic bags. There are no special requirements for the disposal of moldy materials.
   
    
7. The work area and areas immediately surrounding the work area should be HEPA vacuumed and cleaned with a damp cloth and/or mop and a detergent solution.
   
    
8. All areas should be left dry and visibly free from contamination and debris.
   
   This is next section is incorrect.  There are no recommended biocides from the HVAC manufacturers.  Call them, you will find out.

    i.   A variety of biocides are recommended by HVAC manufacturers for use with HVAC components, such as, cooling coils and condensation pans. HVAC manufacturers should be consulted for the products they recommend for use in their systems.