[sudo-discuss] Ventilation fan installed over sudoroom!

[Patrik D'haeseleer]

By the way - if any of you roof monkeys are up there again, it would be
great if someone could also have a look at the exhaust fans above the
entrance hall! Rob mentioned he may have located a switch but didn't have
time to do any troubleshooting yet - not clear if they are getting power,
if the motor is busted, or what. Would be worth running over a temporary
extension cord to check...

I don't have much time to play on the roof this week, but I'd be happy to
pay for a solar powered attic fan if someone can figure out how to mate it
with the vent in the skylight. Home Depot has a couple models in the
$200-300 range
<https://www.homedepot.com/b/Building-Materials-Ventilation-Roofing-Attic-Ventilation-Attic-Fans/Weather-Resistant/Exhaust/Roof-Mount/Solar-Attic-Fan/N-5yc1vZc65uZ1z19cj7Z1z19v14Z1z19ygqZ1z19ynt?NCNI-5&storeSelection=>
.

Patrik

On Wed, Jul 7, 2021 at 4:47 PM Patrik D'haeseleer <patrikd at gmail.com> wrote:

> 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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>>> > sudo-discuss at lists.sudoroom.org
>>> > https://sudoroom.org/lists/listinfo/sudo-discuss
>>> >
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