[labnetwork] final filter on makeup air units

[Dennis Schweiger]

Iulian,

This is what we're running at UofMichigan on our air handlers.

Make up air
MERV-8 prefilter at inlet
MERV-14 filter cartridge behind prefilter
MERV-17 at discharge into clean plenum space, humidity injection is
done after this filter

Recirculating unit
MERV-14 at inlet
HEPA discharge at ceiling grid

Dennis
586.531.3030 Cell

On Jun 4, 2013, at 3:46 PM, Iulian Codreanu <codreanu at udel.edu> wrote:

> Dear Colleagues,
>
> I am trying to convince some folks that having filters placed on the discharge side of a cleanroom makeup air unit (MAU) is not only a good idea but a must.    I only have a MERV 8 and a MERV 14 on the intake side and I am pushing for HEPA filtration on the discharge side; your input carries a lot of weight and I hope you can help.
>
> My cleanroom is "two stories tall"; the makeup air discharges into the mechanical space (it houses the recirculating air units that push the air into the bay plenum boxes) that is above the the bay and chase cleanroom (no raised floor, sidewall air return).
>
> Can you please share your MAU filter configuration; it would be helpful to list all the filters in the unit and where they are located.
>
> Thank you very much.
>
> Iulian
>
> --
> iulian Codreanu, Ph.D.
> Director of Operations, UD Nanofab
> 149 Evans Hall
> Newark, DE 19716
> 302-831-2784
>
>
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