Assembly and method for control and removal of particulate contamination

A method for the prevention of migration of hazardous particulate matter from a negative pressure environment established within an existing building, the negative pressure environment defined as an enclosed space within said building defined by the existing wall structure of said building and temporary wall means, said negative pressure environment having a means for the introduction of an airflow path and the means for the continuous evacuation of air from said negative pressure environment in order to contain said hazardous particulate matter, said method for the prevention of migration of said hazardous particulate matter comprising:

• establishing a secondary wall means parallel to said temporary wall means, said secondary wall means comprising two parallel walls and ceiling contact with the floor, ceiling and end walls of said existing building, said secondary wall means defining an enclosed passageway therebetween;
• covering said exterior walls of said secondary wall means with an impermeable material;
• providing a venting means from the ambient atmosphere to said enclosed passageway;
• communicating said passageway with a collection means and a blower means for the evacuation of air from said enclosed passageway;
• establishing an airflow rate sufficient to establish a greater negative pressure in said enclosed passageway than in said negative pressure environment.