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Fan Powered HEPA or Terminal HEPA Filters
Cleanroom HEPA Filtration Systems

florida cleanroom systems 014   The decision to employ fan powered HEPA filtration modules or to engineer the cleanroom filtration system with static terminal end HEPA filtration modules must address several design and engineering issues. Airflow, filter face velocities required, air change rates and particulate classification all come into focus upon final design review. Cleanroom noise and vibration levels, redundancy, and maintenance requirements will also be substantially affected by the selection of the filtration systems.

   Fan powered filtration modules though twice the cost of terminal end filtration modules offer the feature of redundancy should the main fan fail on the air handling unit. The cleanroom will still be able to maintain its integrity with airflow, air changes, positive pressurization and cleanliness classification while losing temperature and relative humidity control only.

   The operational cost of operating a primary fan in the air handling unit then all the secondary fans in the HEPA filtration modules can be costly in terms of utility usage, maintenance and initial construction cost. Cleanrooms with ceiling heights lower than 10' may find noise and vibration can be higher than anticipated depending on the number of fan powered HEPA filtration units coverage per square foot or ceiling area  

   Terminal end HEPA filtration modules greatly reduce initial construction cost, operational cost, noise, vibration, and require less maintenance cost over the HEPA filter lifecycle but do not offer any redundancy should the main air handing unit fan fail. Secondary air handling systems are required for cleanroom  redundancy or at the least having a spare fan motor in the critical parts inventory that can be changed in a matter of hours.        

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