The newly redesigned, patented* Protector XStream Laboratory Hood was engineered to be the best containing fume hood possible. Testing shows the Protector XStream easily meets containment per SEFA-1 low velocity hood standards when subjected to the ASHRAE 110 test protocol with results of less than 0.05 ppm leak rate when tested at 4.0 lpm at OSHA-recognized 60 fpm face velocity. Using the concepts of fluid dynamics, Labconco engineers designed the Protector XStream Laboratory Hood to produce horizontal airflow, which reduces the tendencies for turbulence. The innovative and aerodynamic designs of the sash handle, air foil, upper dilution air supply and rear down flow baffle work in concert to produce horizontal airflow patterns that significantly reduce concentrations of chemical contaminants throughout the work area, particularly near the operator's breathing zone and at the work surface. Depending on sash position, tendencies for air turbulence, vortexing and "the roll" frequently observed during traditional fume hood smoke tests are virtually eliminated. Safety is foremost, but energy savings is equally impressive. Operating a 6' Protector XStream Hood at 60 fpm face velocity, with the sash in its fully open position, requires only 690 CFM. Regardless of your desired operating face velocity, the Protector XStream yields the lowest required CFM. Energy savings translates to dollar savings. The Protector XStream Hood provides an excellent economic payback when compared to traditional by-pass hoods operated at 80 or 100 fpm. For even greater savings, the Protector XStream may be factory-prepared to accommodate a variable air volume system without the need for by-pass modifications.