As a general rule, the MX6 iBrid with pump is rated to sustain a continuous sample draw for up to 100 feet with 0.125-inch inside diameter sample tubing. However, the pump will provide adequate ﬂow at 0.5 liters per minute up to a vacuum pressure of approximately 30 inches of H2O. The length of the sample tube can exceed 100 feet as long as the vacuum pressure required to draw the sample does not exceed 30 inches of H2O.