Patent ID: 7778735

Claim:
An environmental control system for controlling the environment in a pressurized compartment, said environmental control system comprising: at least first and second adjustable exit valves for selectively allowing gas to exit the pressurized compartment, said first and second exit valves being located, respectively, in first and second portions of the pressurized compartment; and a controller for determining flow rates of gases in at least first and second systems that are located, respectively, in the first and second portions of the pressurized compartment, wherein the flow rates in the first and second systems are variable, said controller also being configured to control at least one of said first and second exit valves at least partly in response to flow rate determinations of gases in at least the first and second systems such that a quantity of gas exiting the pressurized compartment through the first and second exit valves has a direct relationship to the flow rates of the first and second systems, respectively.