I think it's pretty useless for the Hackspace. I doubt we'll need
anywhere near that purity, and (regardless of how we position it) it
will take up an intrusively large part of the wet room.
These things do seem to be quite expensive (a new one is upwards of
£2k), so I suggest we re-list it - correctly - on ebay, perhaps with a
reserve of £50 or so, and hopefully we'll get a decent profit out of
Avoiding contamination of samples could actually get pretty important
if we start making cultures (I have no idea if the biohacking group
has this in mind, but I imagine it would be great to work on algal
biofuels for example).
Because our ability to (legally) add resistance genes (so we can grow
them in the presence of an antibiotic, for example, that would kill
unwanteds) is going to be limited unless we formally announce such
intentions to the HSE (and take steps to enforce elfansafety). So we'd
have to buy them in a resistant form, which isn't very 'DIY'.
That said, I can't see this design of cabinet either being appropriate
for the tiny room it's in (the horizontal airflow gets interrupted and
refluxed by a wall right behind the experimenter). And it would blow
smells and other solvents (maybe flammable) through the door and into
the wider workshop.
What would be useful if we're actually going to handle things that are
alive (it is "bio"hacking after all...) is an easily cleaned lab bench
that we can irradiate with nasty UV every so often to keep it
decontaminated. And a gas outlet for a bunsen burner (which creates
vertical laminar flows from the rising hot air which you can work
under). And an autoclave for glassware.
On 3 June 2011 09:01, Philippe Bradley <philb...@gmail.com> wrote:
> That said, I can't see this design of cabinet either being appropriate
> for the tiny room it's in (the horizontal airflow gets interrupted and
> refluxed by a wall right behind the experimenter). And it would blow
> smells and other solvents (maybe flammable) through the door and into
> the wider workshop.
Both good points as well. It's also worth noting that the ebay
description said the filter needed changing. (Which I suspect is not
Apparently if you're using solvents or anything else hazardous, you
need a vertical laminar flow cabinet so you don't end up blowing
everything towards the experimenter (diagram:
We could hack our horizontal cabinate in to a vertical cabinate by
rotating through 90 degrees.
One suggestion might be to see if the engines/blowers can be mounted
90 deg (so their inlet goes where their outlet currently is)... The
room would be drawing in dusty air from the workshop, but at least it
would filter it before putting it through the motors and then
releasing it to the outside world. If this worked, you could also
maybe mount a screen to work under (usually leaving a 20cm gap to
slide your arms under). This would be good to protect the face from
splashes, and the equipment from spittle; a side-effect, I suppose,
would be to concentrate the airflow to the area close to the bench
surface, which might be a benefit, but I think you'd still work under
a bunsen for sterile work. Still, I dunno if that's sensible. If the
filter's ineffective, you might still have chemicals going through
motors not designed to be on the receiving end of fumes; that's a fire
hasard, let alone a corrosion risk.
> I wish we'd figured that out before spending a few hours trying to
> reverse the motors!
Indeed, though it's nice to know that we were not going mad.
I think it's going to be too big to do anything useful with in the wet room. Perhaps the fan unit could be repurposed for fume extraction. They are pretty great fans.
Otherwise ebay is looking good.
On 3 June 2011 13:44, Sam Cook <sam.lind...@gmail.com> wrote:
I don't think this is possible as the inlets and outlets on the fans have different profiles (20cm circle Vs 20x30 rectangle) also I expect these fans wont work as very good extracts and will likely clog...
I wish I'd listened to you when you said "It's not meant to blow is it?"!
We have a smoke machine, so please be our guest.
I'd hazard not very laminar currently as shortly after leaving the fan
the air promptly meets the wall, some 30 cms from the edge of the table.