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Methods and apparatus for recirculating air in a controlled ventilated environment
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Sash sensor and method of sensing a sash using an array of multiplexed elements
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Inverted venturi flow element for measuring fluid velocity in a conduit
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Networked air measurement system
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Fluid control device with reduced sound generation
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Fluid control device with reduced sound generation
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Acoustic resonator
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Distributed environmental process control system
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Air flow control for pressurized room facility
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Precision gas flow control by use of coarse and fine control elements
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Pressure maintenance system for substantially sealed space
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System for detecting a movable entity within a selected space
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Mechanism for operating multiple air flow control valves
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Method and apparatus for controlling a fluid flow valve
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Method and apparatus for controlling a fume hood
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Fume hood sash sensing apparatus
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Make up air controller for use with fume hood systems
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Fume hood controller
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