Composite gas filtering unit

The method of filtering noxious particulate materials and gases from ambient environment in a filtering unit having spirally wound material having an inner portion and defining an intersticial area for the flow of pneumatic material in the interior portion of the filter medium and surrounding a central manifold comprising the steps of:

• providing filtering medium which promotes the movement of air from a central portion of a cartridge both spirally and radially through fibrous spirally wound impregnated material,
• positioning infuser wings at the interior portion of the filtering medium which define a central manifold and a path for diverting the flow of pneumatic material in the intersticial area defining a pathway between the adjacent spirally wound material sheets by conforming the pneumatic material to said pathway between the material sheets,
• positioning an impeller in the manifold proportioned to centrifugally drive the air from the central manifold outwardly through the infusers and into the spirally wound fabric,
• and driving the air by actuating the impeller.

A filter cartridge comprising, in combination,

• a cartridge body,
• a central manifold of tubular configuration blocked at one end and having a plurality of perforations along its periphery interiorly of the cartridge body,
• a spirally wound fibrous material impregnated with activated or treated charcoal and/or other filtering agents that are adsorptive, chemisorptive, reactive or particulate filtering secured at its inner end to the manifold and spirally wrapped there around to form the cartridge body,
• a plurality of spacers positioned interiorly between adjacent portions of the spirally wound fibrous impregnated material to thereby assist in spacing the same and positioned in a fashion to promote pneumatic agitation to the point of generating some degree of turbulence interiorly of the filter while pneumatic gases are pumped to the interior portion of the manifold and pass through the perforations of said manifold and then outwardly through the fibrous material as well as spirally around the fibrous material and between sheets of the same,
• said spacers being formed of a penetrable exterior bag-like formed material with pelletized activated members interiorly of the bag-like material which are formulated to attack and adsorb or adsorb a variety of noxious gases.

A filter cartridge comprising, in combination,

• a central manifold of tubular configuration blocked at one end and having a plurality of perforations along its periphery,
• a spirally wound fibrous material impregnated with activated or treated charcoal and/or other filtering agents that are adsorptive, absorptive, chemisorptive, reactive or particulate filtering secured at its inner end to the manifold and spirally wrapped there around to form a cartridge body,
• a plurality of spacers positioned interiorly between adjacent portions of the spirally wound fibrous impregnated material to thereby assist in spacing the same and positioned in a fashion to promote pneumatic agitation to the point of generating some degree of turbulence interiorly of the filter while pneumatic gases are pumped to the interior portion of the manifold and pass through the perforations of said manifold and then outwardly through the fibrous material as well as spirally around the fibrous material and between sheets of the same,
• and a HEPA filter operatively positioned in the interior of the tubular central manifold.

A filter unit comprising,

• a filter cartridge,
• end caps for said cartridge,
• infuser wings centrally positioned between opposed end caps and secured thereto,
• each infuser wing having inside and outside edges and ends and a gas path defining portion therebetween,
• said inside edges defining a manifold,
• an impeller positioned in the manifold,
• means for driving the impeller,
• and a plurality of filter medium sheets attached to the outer edges of the infusers and spirally wound in spaced relation to each other thereby defining air flow channels between opposed sheets.