Apparatus for cleaning heating, ventilation, and air conditioning systems

Claim 1

A portable apparatus for cleaning ducts of heating, ventilation, and air conditioning systems in buildings, comprising: a filter housing, wheel elements secured to said housing for supporting the latter for movement over a surface, a horizontal divider wall in said housing dividing the interior of the latter into a lower filter chamber and an upper plenum chamber, said divider wall having a plurality of openings therein, an inlet opening in said filter housing communicating with said filter chamber, an elongate vacuum hose having one end thereof connected in communicating relation with said inlet having its other end thereof for connection in communicating relation with a duct to be cleaned, a plurality of similar vertically disposed cylindrical filter elements, each having a closed lower end and an open upper end secured to said divider wall in one of said openings and depending therefrom into said filter chamber, an outlet opening in said filter housing, means communicating with said plenum chamber, a blower unit housing having an interior defining a fan chamber and having an inlet opening therein communicating with said fan chamber, a fan device positioned in said fan chamber and having an inlet and outlet, wheel elements secured to said blower unit housing for supporting the latter for movement over a surface, conduit means interconnecting the outlet of said plenum chamber with the inlet opening of said fan housing, a final filter housing positioned upon said blower unit housing and being detachably secured thereto, a high efficiency particulate air filter positioned within said final filter housing and being disposed in close proximity to the outlet of said fan device whereby air from the latter will be directed through said high efficiency particulate air filter.