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Roof Vent Fan Ventilation
Posted: Wed Oct 05, 2016 10:58 am
by cuchillo
Hello,
My Skylift roof has a vent towards the back of it and was wondering if anyone has ever tried fitting a fan into that cavity? Its about 89 mm in diameter.
There is a 12 volt supply nearby so wiring it in will not be an issue.
I did have a quick google but have not yet managed to find a bi-directional fan of the right size to fit the cavity.
(I was thinking maybe a PC chassis fan could work here, but they are uni directional)
Thoughts?
TIA
Cuch
Re: Roof Vent Fan Ventilation
Posted: Wed Oct 05, 2016 11:23 am
by Bongolia
I think PC fans are simple DC just flipping the wires should do it shouldn't it?
Re: Roof Vent Fan Ventilation
Posted: Wed Oct 05, 2016 11:26 am
by cuchillo
Bongolia wrote:I think PC fans are simple DC just flipping the wires should do it shouldn't it?
I did consider that, but a couple of things came to light while checking Google. The blades are designed to be uni directional and they tend to have reverse polarity protection to stop you from mis-wiring it.
Don't have one to hand to test it
Re: Roof Vent Fan Ventilation
Posted: Wed Oct 05, 2016 11:44 am
by g8dhe
PC fans are NOT simple DC - they are speed controlled and unidirectional!
Re: Roof Vent Fan Ventilation
Posted: Wed Oct 05, 2016 12:54 pm
by Bongolia
Ahh!
Re: Roof Vent Fan Ventilation
Posted: Sun Oct 16, 2016 7:44 pm
by Jimbobvfr400
Could you mount a PC fan on some sort of quick release mount, to reverse just flip it over.
Re: Roof Vent Fan Ventilation
Posted: Tue Oct 25, 2016 11:35 am
by redrocket
There are many different types of PC fans out there, some 2 pin, simple positive negative, others 3 and 4 pin for speed control etc.
All i have ever tested will all work when you power positive and negative regardless of the other wires, just feel the air coming off to make sure the air is being blown the right way. This is not a bad idea, i find in summer i can go all night fine its when it hits around 7 - 8am im normally cooking inside.
Re: Roof Vent Fan Ventilation
Posted: Sat Oct 29, 2016 5:23 am
by cuchillo
So, here's a thing ....
http://www.magnummotorhomes.co.uk/en/Ro ... -Vent.html
Seems like one already exists!
Anyone seen or used it?
TIA
Re: Roof Vent Fan Ventilation
Posted: Sat Oct 29, 2016 3:44 pm
by Bongolia
Never used one but seen them on caravans and motor homes.
Where would it fit on an ATF though?
Re: Roof Vent Fan Ventilation
Posted: Sat Oct 29, 2016 3:46 pm
by cuchillo
Hello,
Bongolia wrote:Never used one but seen them on caravans and motor homes.
Where would it fit on an ATF though?
Not an ATF. It's a skylift roof from JAL that comes with a mushroom vent at the back of it. I think it's the same size as this vent so could be a straight swap out, plus a bit of wiring.
Least, that's the theory!
