Abstract: An improved power-driven brush assembly is disclosed, useful for cleaning the interior surfaces of ducts, pipes, and other similar structures. The apparatus comprises a cable having a brush at one end, and a motor at the other end for spinning the cable and the brush. A casing surrounds the cable, allowing a fluid to be injected through the casing to the brush. A fluid directing assembly at the end of the casing near the brush allows fluid to the be injected into the duct in a desired direction, to flush particulate matter from the vicinity of the brush.

Abstract: A modular filtration system for cleaning HVAC ductwork includes first and second modular assemblies containing a plurality of filters. The modules can be easily transported into a site and connected to one another and to the ductwork. The system includes a plurality of wheels and external assembly protruding from the housing to assist in wheeling the housing up and down stairs.

Abstract: A method is disclosed for cleaning HVAC ductwork, including the steps of transporting first and second modular filter assemblies to a site, connecting them in sealed fluid communication with one another and to the ductwork, drawing fluid through the filtration system from the HVAC ductwork, exhausting filtered fluid from the filtration system and tilting the housing so that any stairs present at the site bear against a bearing surface of an external conveyance assembly as the modules are transported up and down stairs.

Abstract: Portable vacuum and air filtration units including a plurality of separately transportable modules are disclosed. Some units include a mechanism for locking the modules together during use, an air inlet located in one of the modules, a debris screen and a mechanism for receiving debris stopped by the screen located in one of the modules, an electrostatic filter located in one of the modules, a bag filter assembly located in one of the modules, a HEPA filter assembly located in one of the modules, and a mechanism for drawing a substantial volume of air through the inlet, screen, electrostatic filter, bag filter assembly and HEPA filter assembly. Other units include a pliable, tubular mesh for filtering debris.

Abstract: A portable vacuum and air filtration unit, comprising: a plurality of separately transportable modules and a means for locking the modules together during use, an air inlet located in one of the modules, a debris screen and a means for receiving debris stopped by the screen located in one of the modules, an electrostatic filter located in one of the modules of some embodiments of the invention, a bag filter assembly located in one of the modules, a HEPA filter assembly located in one of the modules, and a means for drawing a substantial volume of air through the inlet, screen, electrostatic filter, bag filter assembly and HEPA filter assembly.

Abstract: A metal mesh protective glove extending continuously around the user's hand and fingers. A continuous cuff extends around the circumference of the glove near the user's wrist and encloses a strap which is free to slide in and is removable from the cuff. The opposite ends of the strap extend from an opening in the cuff; and the strap includes means to secure its ends to each other to form a band of varying length so that the strap and cuff may be tightened about the wearer's wrist with minimum folding or drooping of the glove mesh.