Generally this force is 0.25 inches of water column, but may be lifted or lowered as the method involves. Isolators should be periodically leak tested to be certain their integrity and prevent escape from the decontamination agent. Leak testing can be achieved by various approaches which include tension decay https://www.tumblr.com/tailinscitech/805882763435802624/enhancing-lab-efficiency-with-tailin-toc-analyzer?source=share