Prior to initiating any cleaning activities, DUCTZ or an independent Indoor Air Quality Consultant should determine the system cleanliness and economic practicality of undertaking restorative cleaning activities.

This determination shall include a site survey of the building; a visual assessment of the HVAC system’s components; age of the components under consideration; and an economic assessment of HVAC system cleaning versus equipment/component replacement.

Upon completion of the analysis, and in accordance with the clients’ needs, the criteria for level of cleanliness shall be established, documented and agreed upon by all involved parties. Visible contaminants within HVAC systems from rodent or insect infestation, storm or flood damage, water infiltration, fire and smoke damage, mold, construction or remodeling particulates, or general debris blowing out of supply registers or grilles are conditions necessitating implementation of this standard.

This process can be conducted by DUCTZ may require the involvement of a third-party Indoor Environmental Professional (IEP) whenever correlations, or assertions, of HVAC system cleanliness are linked to occupant health.

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