Apparatus and method for cleaning and decontaminating an air distribution system

A method for cleaning the ductwork of an air distribution system having inlets and outlets, the method comprising the steps of:

• (a) providing an injector having a mixing chamber, first and second distribution subsystems, a first source containing a first fluid, and a second source containing a second fluid;
• (b) connecting the first and second distribution subsystems in flow communication with the mixing chamber;
• (c) blocking the inlets and outlets of ductwork of an existing air distribution system;
• (d) connecting:
• (1) the first source to the first distribution subsystem, and
• (2) the second source to the second distribution subsystem;
• (e) pressurizing the first and second fluids in the first and second distribution subsystems;
• (f) controlling pressurization of the first and second fluids in the first and second distribution subsystems to thereby cause:
• (1) the first and second fluids to be converted into a foam-like substance in the mixing chamber, and
• (2) the foam-like substance to be injected from the mixing chamber into the ductwork;
• (g) continuing conversion of the first and second fluids into the foam-like substance and injection of the foam-like substance from the mixing chamber into the ductwork until the ductwork is completely filled with the foam-like substance wherein all contaminants and debris in, and on internal surfaces of, the ductwork are absorbed and entrapped by the foam-like substance;
• and
• (h) subsequently removing:
• (1) the foam-like substance from the ductwork, and
• (2) the blocking of the inlets and outlets of the ductwork.