With a built-in gas analyzer that can give absolute exhaust, room air and Interfilter values in parts-per-million (PPM) theIndependenceductless fume hood is powered by the AirClean Operating System. This fume hood system has an onboard chemical database with over 1000 chemicals approved for use in theIndependenceseries of hoods. With a new filtration system known as Silconazyne, that combines two filtration technologies.