Patent ID: 8133310

Claim:
A containment system, comprising: a housing having an airflow inlet aperture and an airflow outlet aperture; a filter mounting portion disposed in the housing between the inlet and outlet apertures and configured to sealingly secure a filter in the housing in a position that filters air flowing from the inlet aperture to the outlet aperture through the housing; a plurality of ports formed through the housing, wherein the plurality of ports include at least a downstream sample port and an upstream sample port; a first valve assembly having a first port coupled to the upstream sample port, a second port, and a third port, and a second valve assembly having a first port coupled to one of the downstream sample port, a second port, and a third port, wherein each of the valve assemblies have at least three operational states, wherein the operational states comprise: a first state preventing flow from the sample port from passing through the first port; a second state fluidly coupling the first and second ports; and a third state fluidly coupling the second and third ports.