With no detectable leaks greater than 1 x 10-6 ml/sec, filtered glove boxes offer the advantages of low volume-filtered ventilation enclosures while ensuring a totally isolated working environment. The units provide inlet and outlet 99.99% efficient HEPA or 99.999% efficient ULPA filtration and a leak-tight physical barrier to protect the operator from exposure to potentially hazardous materials. They feature particulate containment <20 nanograms per cubic meter as confirmed by Safebridge Consultants and meet ISO Class 4 standards. Real-time performance data is provided on internal static pressure (inches of water) and air provides safe filter removal and replacement. Liners are available in either one-piece moulded fiberglass or Type 304 stainless steel.