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The fixed volume enclosure shall be constructed with rigid panels that maintain a fixed enclosure volume, which shall be referred to as Vn. Vn shall be determined by measuring all pertinent dimensions of the enclosure including internal fixtures to an accuracy of ¡À 1/8 inch (0.5 cm) and calculating the net Vn to the nearest 1 ft3. The enclosure shall be equipped with an outlet flow stream that withdraws air at a low, constant rate and provides makeup air as needed, or by reversing the flow of air into and out of the enclosure in response to rising or falling temperatures.

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