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  1. winind

    Clean Room Pressurization

    The system is 100% outside air. Supply Air = 1400 cfm (from 60 ach) + 2 ach exfiltration = 1453 cfm. Where, ach is the air changes per hour. Exhaust Air = 1400 cfm This should maintain a slightly positive room pressure because SA > EA.
  2. winind

    Clean Room Pressurization

    I am designing the HCAC system for a small clean room (~200ft^2 w/ 8ft ceiling, Class 10,000). The client wants 60 air changes per hour with 0.05 in WG positive pressure (relative to building). How do I calculate the amount of exhaust air to provide positive room pressurization?

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