Fan Powered HEPA or Terminal HEPA Filters
Cleanroom HEPA Filtration Systems
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
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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