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Bat VOC air-collection apparatus assembly. Xitech vacuum chamber (at right, containing PE-AL VOC air-sampling bag inside) with glass bat air-sampling chamber (at left) connected via two port valves to FEP tubing with Port 1 (receiving air inflow from pure zero-air replacement bag), and Port 2 (allowing outflow of bat sample air to input port of Xitech air-collection chamber and internal VOC air-collection bag).
