Re: [DIYbio] Re: low cost positive pressure laminar flow HEPA filtered box

I can't imagine "lint free" can be guaranteed enough for industrial
standard with a sheet, either. At least, not with a sheet that's cheaper
than a large HEPA filter in the first place.

On 28/01/15 15:07, John Griessen wrote:
> On 01/28/2015 07:57 AM, Cathal Garvey wrote:
>> Could you mimic this though, by passing air through a HEPA and then
>> having it (inside the sterile space) pass through a lint-free,
>> pre-sterilised fabric sheet?
>
> Yes, and that would protect your filter from splashes also. Muslin
> might be right for it, or maybe cheesecloth...
> The filter still needs to flow slowly enough to work well,
> so it still needs to be large enough...just how large is probably a
> measure-test-repeat-while-necessary design process though.
>
> Fabric must seem too "homey" to be an industry standard. The industry
> standard way you see in ads is a filter,
> then a plenum, (or manifold), then a panel with slots to release
> the air. The panel is the full size of the back of the rectangular box
> of the flow hood. I'm sure some kind
> of stretched fabric could do even better at laminar flow than a panel
> with slots.
>
> Probably the wall of slots is the best compromise between needing to
> "change the sheets" often, and having a little
> dust left after wiping down the front surface of the wall of slots.
> Since we think of a flow bench as durable,
> there needs to be a way to clean it.
>

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