Abstract: A filtration unit for aspirating infectious aerosols and spray droplets expelled from a patient's mouth is disclosed. The filtration unit has a housing defining an air inlet; an articulated tube assembly fluidly connected to the air inlet; a hood connected to the tube assembly; a fan disposed in the lower portion of the housing; and at least one filter disposed in the housing vertically above the fan and fluidly between the air inlet and at least one air outlet defined in the filtration unit. During operation of the fan, air flows sequentially through the hood, then through the articulated tube assembly, then through the air inlet into the housing, then through the at least one filter, and then out of the housing via the at least one air outlet. A method of using the filtration unit is also disclosed.

Abstract: A damper includes first and second blade assemblies disposed next to one another and rotatably supported by a frame to rotate together between open and closed positions. Each of the first and second blade assemblies includes a shaft and first and second blades connected to the shaft. The first and second blade assemblies have respective first and second seal members connected to the blades thereof. In the closed position, the first seal member abuts the second blade assembly at a first contact point to form a first seal, and the second seal member abuts the second blade assembly at a second contact point to form a second seal. The first contact point is further from a blade rotation axis of the first blade assembly than the second contact point. The second contact point is further from a blade rotation axis of the second blade assembly than the first contact point.

Abstract: A method for replacing a filter in a dust collector includes: accessing a filter carriage, at least one filter being connected to the filter carriage and being disposed inside a dust collector housing of the dust collector; lowering the filter carriage, the at least one filter being lowered with the filter carriage; translating the filter carriage out of the dust collector housing with the at least one filter; removing the at least one filter from the filter carriage; placing at least one other filter on the filter carriage; translating the filter carriage into the dust collector housing with the at least one other filter; and raising the filter carriage to lock the at least one other filter into an operational location.

Abstract: A method for replacing a filter in a dust collector includes: accessing a filter carriage, at least one filter being connected to the filter carriage and being disposed inside a dust collector housing of the dust collector; lowering the filter carriage, the at least one filter being lowered with the filter carriage; translating the filter carriage out of the dust collector housing with the at least one filter; removing the at least one filter from the filter carriage; placing at least one other filter on the filter carriage; translating the filter carriage into the dust collector housing with the at least one other filter; and raising the filter carriage to lock the at least one other filter into an operational location.

Abstract: A removable filter system and a dust collector with the removable filter system. The dust collector includes a filter carriage movably connected to a carriage base; at least one filter and filter support removably connected to the filter carriage. The filter carriage is movable between at least three positions: in the first position the filter being in an operational location, in the second position the filter being vertically lower but inside the dust collector, and in the third position the filter being outside the dust collector. A method for replacing a filter in the dust collector includes lowering the filter with the filter carriage; translating the filter and carriage out of the dust collector housing; removing the filter from the carriage; placing a replacement filter on the carriage; translating the replacement into the dust collector housing; and raising the filter carriage to lock the replaced filter into an operational location.

Abstract: A removable filter system and a dust collector with the removable filter system. The dust collector includes a filter carriage movably connected to a carriage base; at least one filter and filter support removably connected to the filter carriage. The filter carriage is movable between at least three positions: in the first position the filter being in an operational location, in the second position the filter being vertically lower but inside the dust collector, and in the third position the filter being outside the dust collector. A method for replacing a filter in the dust collector includes lowering the filter with the filter carriage; translating the filter and carriage out of the dust collector housing; removing the filter from the carriage; placing a replacement filter on the carriage; translating the replacement into the dust collector housing; and raising the filter carriage to lock the replaced filter into an operational location.

Abstract: A removable filter system and a dust collector with the removable filter system. The dust collector includes a filter carriage movably connected to a carriage base; at least one filter and filter support removably connected to the filter carriage. The filter carriage is movable between at least three positions: in the first position the filter being in an operational location, in the second position the filter being vertically lower but inside the dust collector, and in the third position the filter being outside the dust collector. A method for replacing a filter in the dust collector includes lowering the filter with the filter carriage; translating the filter and carriage out of the dust collector housing; removing the filter from the carriage; placing a replacement filter on the carriage; translating the replacement into the dust collector housing; and raising the filter carriage to lock the replaced filter into an operational location.

Abstract: A dust collector including a housing including an upper wall, at least one housing wall defining an inlet, and one of the upper wall and the at least one housing wall defining an outlet; a separating plate connected above the inlet and below the outlet, and defining at least one aperture; at least one vertically extending filter connected to and extending below the plate, and fluidly communicating with the at least one aperture; at least one pipe connecting the at least one vertically extending filter to the plate and extending below the plate; at least one expandable sleeve surrounding the pipe, the pipe defining at least one side aperture fluidly communicating an interior of the pipe with a space between the pipe and the sleeve; and an air injector system fluidly communicating with the aperture for injecting air into the space through the aperture to expand the sleeve.

Abstract: A dust collector including a housing including an upper wall, at least one housing wall defining an inlet, and one of the upper wall and the at least one housing wall defining an outlet; a separating plate connected above the inlet and below the outlet, and defining at least one aperture; at least one vertically extending filter connected to and extending below the plate, and fluidly communicating with the at least one aperture; at least one pipe connecting the at least one vertically extending filter to the plate and extending below the plate; at least one expandable sleeve surrounding the pipe, the pipe defining at least one side aperture fluidly communicating an interior of the pipe with a space between the pipe and the sleeve; and an air injector system fluidly communicating with the aperture for injecting air into the space through the aperture to expand the sleeve.

Abstract: A dust collector including a housing including an upper wall, at least one housing wall defining an inlet, and the upper wall or the housing wall defining an outlet opposite the inlet, the inlet and the outlet at a same height; a separating plate diagonally connected to the housing above the inlet and below the outlet and extending downward from the inlet, the separating plate defines at least two substantially parallel rows of staggered apertures, an entrance duct section fluidly connected to the housing and including a duct top surface oriented diagonally upward from the housing and away from the at least one housing wall; and a plurality of vertically extending filters connected to and extending below the separating plate, a center line of the inlet extending above a top portion of the filters, each of the filters fluidly communicating with a corresponding one of the first and second apertures.

Abstract: A dust collector including a housing including an upper wall, at least one housing wall defining an inlet, and the upper wall or the housing wall defining an outlet opposite the inlet, the inlet and the outlet at a same height; a separating plate diagonally connected to the housing above the inlet and below the outlet and extending downward from the inlet, the separating plate defines at least two substantially parallel rows of staggered apertures, an entrance duct section fluidly connected to the housing and including a duct top surface oriented diagonally upward from the housing and away from the at least one housing wall; and a plurality of vertically extending filters connected to and extending below the separating plate, a center line of the inlet extending above a top portion of the filters, each of the filters fluidly communicating with a corresponding one of the first and second apertures.