A device for removing oil mist and odors from an airstream, comprising: a base having an air inlet in the lower end thereof for receiving an airstream and a channel formed around said air inlet opening; a first tubular filter having a first end and a second end, said first end mounted on said base wherein said first tubular filter defines an inner chamber that is in communication with said air inlet and wherein said first filter is dimensioned to filter oil from said airstream; a second tubular filter having a first end and a second end, said first end mounted on said base, said second tubular filter surrounding said first tubular filter and defining an outer chamber therebetween that communicates with said channel in said base, said second tubular filter being disposed downstream of said first tubular filter; an opening through said base, said opening connecting said outer chamber with said air inlet; a valve element disposed in said opening of said base, said valve element allowing flow from said outer chamber, through said opening and to said air inlet when pressure in said outer chamber exceeds pressure in said air inlet; a cap secured on said second end of said first tubular filter to close said second end; a cover secured on said second end of said second tubular filter to close said second end; at least two rods (152, 154) positioned on opposite sides of said outer chamber, each of said at least two rods (152, 154) having a first threaded end secured to first threaded bores in said base and a second threaded end received by an aperture of the cap therethrough and an aperture of the cover therethrough, first fastening elements that are each threaded onto the second threaded end of one of the rods (152, 154) received through the aperture of the cap to secure said cap onto said second end of said first tubular filter and said first tubular filter onto said base; and second fastening elements that are each threaded onto the second threaded end of the one of the rods (152, 154) received through the aperture of the cover to secure said cover onto said second end of said second tubular filter and said second tubular filter onto said base. a base having an air inlet in the lower end thereof for receiving an airstream and a channel formed around said air inlet opening; a first tubular filter having a first end and a second end, said first end mounted on said base wherein said first tubular filter defines an inner chamber that is in communication with said air inlet and wherein said first filter is dimensioned to filter oil from said airstream; a second tubular filter having a first end and a second end, said first end mounted on said base, said second tubular filter surrounding said first tubular filter and defining an outer chamber therebetween that communicates with said channel in said base, said second tubular filter being disposed downstream of said first tubular filter; an opening through said base, said opening connecting said outer chamber with said air inlet; a valve element disposed in said opening of said base, said valve element allowing flow from said outer chamber, through said opening and to said air inlet when pressure in said outer chamber exceeds pressure in said air inlet; a cap secured on said second end of said first tubular filter to close said second end; a cover secured on said second end of said second tubular filter to close said second end; at least two rods (152, 154) positioned on opposite sides of said outer chamber, each of said at least two rods (152, 154) having a first threaded end secured to first threaded bores in said base and a second threaded end received by an aperture of the cap therethrough and an aperture of the cover therethrough, first fastening elements that are each threaded onto the second threaded end of one of the rods (152, 154) received through the aperture of the cap to secure said cap onto said second end of said first tubular filter and said first tubular filter onto said base; and second fastening elements that are each threaded onto the second threaded end of the one of the rods (152, 154) received through the aperture of the cover to secure said cover onto said second end of said second tubular filter and said second tubular filter onto said base.