The CleanAir Sample Gas Distribution Module is designed to interface CEM analyzers with four individual sample gas streams. A back pressure regulator controls the sample pressure to provide a steady flow rate to the analyzers. In calibration mode the sample gas is bypassed to the vent and a calibration gas port is routed to the analyzers for internal calibration. The calibration mode can be controlled manually by a front panel push button or remotely from your data acquisition system. A disposable sample inlet filter is mounted on the back panel for easy access. The Sample Gas Distribution Module combined with a Calibration Module can make controlling sample and calibration gases to your analyzers simple and easy.