Terra Universal`s Filtration/Recirculation Glove Box features dual-filter modules that remove particles, aerosols and chemical vapors from a process gas before it is either exhausted from/or recirculated through the chamber. A 1650 rpm impeller blower circulates the air stream, and an optional diverter valve lets the user determine the mixture of fresh/recirculated make-up air. Particle filters (99.99 percent efficient HEPA or 99.999 percent efficient ULPA) and activated carbon purification filters are available to suit specific applications requirements. Glove boxes are constructed of several materials, including stainless steel, acrylic and static-dissipative PVC. Other options include ionizers, process gas heaters, coolers, dryers and humidifiers.