Patent ID: 8372186
Filing Date: 2013-02-12
Classification: B01D,B01L,B08B,F24F,G01N

Abstract:
1. A ductless fume hood comprising: a hood enclosure comprising a slideable window and a baffle, wherein the slideable window is open to a room for ingress of room air into the hood enclosure for combination with contaminated air generated in the hood enclosure to form an effluent stream; optionally at least one high efficiency particulate air (HEPA) filter; at least one chemical removal filter; a detection system comprising a photo-ionization detector (PID); an exhaust stack; and a motor, wherein the motor draws the effluent stream serially through the baffle, the optional at least one HEPA filter and the at least one chemical filter for egress at the exhaust stack, wherein the detection system comprises (i) a first gas valve that is positioned downstream of and communicatively connected to at least one of exhaust gas, interfilter gas, reference gas, room air and contaminant-free air, and (ii) a gas metering pump and a gas detection chamber communicatively connected and positioned downstream of the first gas valve.