[sudo-discuss] Ventilation fan installed over sudoroom!

[Patrik D'haeseleer]

Yay! How noisy does this fan wind up being when it's running? If I remember
correctly, this is a 2000 CFM inline duct fan, which seems overpowered for
use as an exhaust fan.

The power issue is also why I had been looking into solar powered exhaust
fans - you can power a 1000 CFM attic fan fairly easily from just a 15W
solar panel. (The reason why Jake's fan is 500W is because it's designed to
push that 2000 CFM through a network of ducts.)

We might want to loop in Rob's friend Elon, who knows quite a bit about
building ventilation, and has been checking out air turnover rates in the
building with an eye on reopening for events.

Patrik

On Wed, Jul 7, 2021 at 3:43 PM Autonomous <autonomous666 at gmail.com> wrote:

> I would also add that this type of exhaust fan is not designed for
> continuous use due to overheating and the potential fire hazard risk. I
> have a similar type of fan installed in a 4800 sqft building that is cycled
> 30 minutes on and 30 minutes off. It can become quite hot after 30 minutes
> especially in warm weather.
>
> On Wed, Jul 7, 2021 at 5:10 PM Eric O'Connor <eric at oco.nnor.org> wrote:
>
>> At the risk of being a downer (but I also know Sudo/Omni is having
>> insurance issues), I just wanted to point out that Cal Fire code 605.5
>> recommends against an extension cord going through a ceiling or wall.
>>
>> > Extension cords and flexible cords shall not be affixed to structures,
>> extended through walls, ceilings or floors, or under doors or floor
>> coverings, nor shall such cords be subject to environmental damage or
>> physical impact.
>>
>> As long as it has a drip loop it’s probably fine, but I’m not an
>> inspector, and haven’t seen the fan either.
>>
>> Sorry if this is not helpful for whatever reason. If that is the case,
>> just add this email to the long list of useless information flowing around
>> the internet :)
>>
>> On a more positive note: The control system ideas sound rad!
>>
>> Eric
>>
>> On Wed, Jul 7, 2021, at 13:48, Jake wrote:
>> > Last night an intrepid cabal of hackers hacked their way through a
>> skylight to
>> > install a high-flow ventilation fan on the roof!
>> >
>> > The power cord hangs down into sudoroom so that mice and tiny hackers
>> can
>> > rappel down into the space rather than use the door like a noob.  Also
>> the
>> > power cord can be used to supply power to the fan so that it runs.
>> >
>> > It uses 500 watts but is quite powerful.  I haven't seen our electric
>> bill but
>> > assuming we're paying about 25 cents per kilowatt-hour, leaving it on
>> all the
>> > time will cost us $3 per day, or $92 dollars per month.
>> >
>> > I think that rather than leaving the fan on all the time, we should
>> create a
>> > sophisticated control system using a microphone and AI machine learning
>> to
>> > detect when people are flapping their mouths (meat talking) in the
>> space, and
>> > turn on the fan during those times.  We can also measure humidity, or
>> have a
>> > camera watching for motion, or even look at network traffic and see if
>> people
>> > are using data in the nearby area.  I can supply the relay connected to
>> a
>> > server where this software can make those decisions.
>> >
>> > here is a picture of the finished product as viewed by birds.  If you
>> want to
>> > see what it looks like from below, go into sudoroom and plug it in.
>> >
>> > https://sudoroom.org/wiki/File:Sudo_apt_install_vent_fan_on_roof.jpg
>> >
>> > -jake
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>> >
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