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5 and 2 air changes per hour that correspond to 18 [ft. Air entered the room through supply diffusers on one side, as shown in Figure 1, passed across the room, and exited through return grills into a duct at a rate of 21 room air changes per hour with a velocity of 225 feet per minute at the diffusers. Separate HVAC system for lab facilities, with adequate air changes per hour |
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