Steril-Aire DE 422 VOS fixed position, Ceiling or Wall mounted, UVC troffer Emitter fixture for surgical suite, DNA Lab or other hi-purity requirements. The DE 422 provides off-hours room and surface disinfection of amplicon, biocontaminants or organic DNA fragments from fixed ceiling and or wall positions. The polished aluminum troffer has (2) DE 421VOS UVC Emitters with Sleeved bulbs, 115-277/1/60, field mounted and wired into wall/ceiling cavity and building systems by others.