Usually this tension is 0.25 inches of water column, but is usually elevated or lowered as the method requires. Isolators have to be periodically leak tested to be certain their integrity and prevent escape in the decontamination agent. Leak testing can be done by different procedures like force decay https://www.tumblr.com/tailinscitech/805881091208724480/applications-and-benefits-of-tailin-containment?source=share