from ambient air into lower chamber 29 panels 58 of activated charcoal are provided surrounding the inlet 50 to blower 46 such that air admitted into blower 46 first passes through charcoal panels 58 for odor control the rack portion 16 includes a cantilevered top wall 60 and a lower cabinet portion 62 lower cabinet portion 62 is a box having a top wall bottom wall and side walls defining a reservoir chamber 62 39 with a front wall 70 having a grid 72 for admitting air through the grid 72 into chamber 62 39 air from chamber 62 39 flows into chamber 29 and into blower inlet 50 the rack portion 14 also includes side walls 74 and a plurality of shelves 76 extending between side walls 74 the spacing of the shelves 76 is selected so that any conventional animal cage 78 may be disposed on a shelf 76 a transparent flexible plastic curtain 80 is provided suspended from top wall 60 curtain 80 is sized to extend completely from top wall 60 to a floor 25 curtain 80 defines an enclosed work area 86 exposed to the shelving 76 and animal cages 78 the work area 86 is sized for an operator to work comfortably while tending to animals with the cages 78 in shelves 76 the curtain 80 has a slit 84 for permitting an operator to open the curtain and enter and exit work area 86 but leaving work area 86 enclosed and sealed after the workers has completed its entry or exit of the area 86 slit 84 may be sealed through any suitable means such as a velcro seal or a zipper seal cantilevered top wall 60 has a screened portion 88 above work.