The PM2.5 high volume air sampler collects particulates at a flow rate between 36-60 cfm through a PM2.5 size selective inlet. As the particulates travel through the size selective inlet the larger particulates are trapped inside of the inlet as the smaller PM2.5 particulates continue to travel through the PM2.5 inlet and are collected on the 8″ x 10″ quartz filter paper. This quartz filter is weighed previously to sampling and after the sampling to determine the mass of particulates that are smaller than 2.5 microns. The flow rate on this instrument is controlled by either a mass flow controller, a volumetric flow controller or the Tisch Environmental PLUS technology electronic flow controller. Tisch Environmental offers a wide range of PM2.5 samplers with several different options to fit every custom sampling installation.