7 Jul
2021
7 Jul
'21
5:05 p.m.
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(a)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(a)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(a)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.
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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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