When using

When using mechanical cleaning techniques, care must be taken to avoid damaging insulated or lined duct work. Fiber glass insulated components should be cleaned using HEPA filtered exhaust equipment while the system is maintained under negative pressure. Fibrous glass insulated materials identified as damaged prior to or following system cleaning should be identified and replaced. Potential damage to fibrous glass insulation materials includes delaminating, friable material, fungal growth, or damp, wet material. If fiber glass insulation material must be replaced, all replacement materials and repair work must conform to applicable industry standards and codes.