Patent ID: 7887639

Claim:
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.