Two chambers at Argonne were used to conduct the study. In the first chamber, Guha and his team produced aerosols with dry particles of sodium chloride, a standard method in respirator testing. From there, a PVC pipe led to the collection chamber, which is where the fabric was held in place by clamps. The collection chamber had a fan that sucked the air, so it flowed from the generation chamber to the collection chamber. Guha said they used specialized equipment that measured the density of the particles upstream and downstream of the fabric.