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The principal assembly activities will be performed in the Tokamak Building, where the ITER device will be installed inside of a partially embedded, concrete bioshield. For the duration of assembly activities, the Tokamak Building will be operated as a "clean area" (see box) and maintained at a constant temperature to avoid dimensional changes in the largest components. Pre-assembly activities will take place in the adjacent Assembly Building."Clean areas" for machine assembly are controlled to maintain air at a uniform temperature of 20°C (winter) to 25°C (summer) +/- 2°C and relative humidity <70%. A dedicated HVAC (heating, ventilation and air conditioning) system and anti-dust coating on the floor of the Tokamak Building will contribute to maintaining the air quality required by the assembly operations for the ITER vacuum components.