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MR Modulo Adjustable Constant Airflow Regulators balances airflows in heating, ventilation or air conditioning ductwork. They fit easily into round ductwork to maintain constant and reliable airflow within a wide range of differential pressure (0.2-1.0 in. w.g./50 - 250 Pa). The MR Modulo's flexible membrane inflates and deflates according to the difference in pressure between the upstream and downstream flow, thus self-adjusting the airflow. This principle of operation guarantees constant airflow regardless of pressure variations in the ductwork. Available in 4"(10-50 CFM), 5"(10-50 CFM), 5"(60-115 CFM), 6"(60-140 CFM), 8"(130-235 CFM) and 10"(175-385 CFM).