Abstract: A portable, modular vacuum collection apparatus includes a prefilter unit, a vacuum generator unit and a final Hepa filter unit which are releasably secured together. The prefilter unit is provided with a plurality of similar tubular flexible filters and the vacuum generator is powered by a variable frequency drive motor for optimizing the performance of the system. The vacuum collection apparatus is readily portable and is effective for use in cleaning and decontamination of HVAC systems.

Abstract: A rotary air-driven brush device for cleaning air ducts comprises a reversible rotary air motor connected to a source of air under pressure and having a threaded output shaft. A brush head includes an inner mounting member secured to the output shaft and an outer housing spaced from the inner mounting member. A plurality of brush members are removably mounted in axially spaced apart openings extending through the brush head mounting member. The brush members include tubular bristle holder elements which are secured in the openings in the brush head by set screws. A plurality of support legs having rollers thereon support and guide the brush head within the duct during the duct cleaning operation.

Abstract: An apparatus for cleaning ducts for heating, ventilation, and air conditioning systems in a building includes a portable primary filter unit and a portable blower and final filter unit. The contaminant material is first loosened in the ducts and is entrained in a stream of air produced by the blower and final filter unit at a vacuum of approximately 4,000 cfm. The air entrained contaminants are passed upwardly through cylindrical filter elements in the primary filter unit where over 90% of the contaminants are removed. The partially contaminated stream is then directed into a fan chamber in the blower and final filter unit, and is then directed through a high efficiency particulate air filter where the remaining contaminants are removed before being discharged into the interior of the building.