9" X 9" fan ? - Fiberglass RV


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Old 02-10-2012, 01:44 PM   #1
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9" X 9" fan ?

I've been searching but a lot of fan descriptions/specs don't list the size. I've looked enough to know the "standard" replacement is 14".

Does anyone have a lead on a decent 9" fan I can put in my '77 Trillium?

Thanks for your help - Mike
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Old 02-10-2012, 02:26 PM   #2
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Mike, I know there's 9"x9" vents available... but somewhere on the forums here is a mod that someone did by using a computer fan to the vent. I don't have time to look for it right now, but that may help you search on your own.
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Old 02-10-2012, 03:18 PM   #3
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Hi Mike, I'm in the process of the same mod (among many others). I'm apposed to cutting a bigger hole in the roof to house the highly rated Fantastic fan. That and from what I've read here, most people prefer the lowest setting (478CFM) or wish it could be set lower. There are two options I can find. One, as Donna suggested, is to use a computer fan. The largest available are 200mm (7.87"). They push out around 110 CFM and are focused on running quite (they're designed for computer gamers). Brands are Cooler Master Mega Flow or the Antec big boy. Both can be found on Amazon or ebay. I'm thinking I might cut a piece of plastic to frame it in then just lay it on top off the heavy duty screen in my boler with a small hole to run the cable through. This way I can use the existing vent cover. Very cheap ($20-$40)mod with little work.

The second idea is to use a solar powered marine vent. The better ones run 1100 CFH = a meagre 18 CFM. These are meant to prevent moisture build up or a hot enclosed RV (or boat). I've wondered if anyone else here has thought of these for mould control. There's the advantage of not running wire. The disadvantage is not getting a breeze effect or perhaps just not enough air flow period. The fit is also a concern. Most are less than 9" round which would require some flanging and water sealing. They may extend down into the cabin an inch or so.

They are pricier.
Amazon.com: Sunforce 81300 Stainless Steel Solar Vent: Automotive

The only one I could find that was square and actually bigger than 9". Barely.
Amazon.com: Square Solar Powered Ventilator Water Resistant with Rechargeable Battery: Sports & Outdoors

I was hoping to get this done and post it w/pics so I could give back something more than my opinion to the FGRV community but if you can beat me to it, go for it.

I'm heading to Burning Man this year and will be siting in the desert for a week. I will need some sort of fan. Especially if I'm away from a closed up boler for hours. Any feed back or changes to these ideas are welcome

Cheers,
Mark
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Old 02-10-2012, 03:43 PM   #4
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Originally Posted by WildBirder View Post
Hi Mike, I'm in the process of the same mod (among many others). I'm apposed to cutting a bigger hole in the roof to house the highly rated Fantastic fan. That and from what I've read here, most people prefer the lowest setting (478CFM) or wish it could be set lower.
Mark, on this point one of the things my dad and I are going to tinker with is adding a 12v dimmer/rheostat to the wiring of the fantastic fan I just got for my Burro re-do. In theory it should offer more options for fan speed. I haven't yet starting digging around to find the gadget I'll need to make it happen.
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Old 02-10-2012, 04:02 PM   #5
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WildBirder- I have two of the first solar fans you linked to. I wouldn't put those in the RV. I got them for a small storage building. They are SUPER quiet, but don't move much air.

I think the Fantastic Fan should come with a rheostat. I've read too many threads about how fast they run. I'm new to RV'n and maybe I'm naive, but I think some of the stuff made for RV's are WAY over-priced. (The Fantastic fan is one of them).
The computer fan sounds like the way to go for a cheapy like me.
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Old 02-10-2012, 04:11 PM   #6
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The solar powered vent is very small, I installed one in my T@da bathroom, it is about 4-5" in diameter and moves enough air for a 2x3 confined space. For anything larger your all need a Northern Breeze of Fantastic Fan. To slow down the fan speed on the fantastic fan you merely install a 10 ohm resistor and that will cut the speed in half or buy the upgrade kit which gives you 14 speeds. Call them and will provide the parts, I recently upgraded mine with insulated covers and a reverse switch with thermostat and resistor.
The fantastic and northern breeze will cool the entire trailer, the little solar fan will have no effect in your rv.
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Old 02-10-2012, 04:21 PM   #7
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Quote:
Originally Posted by jen b View Post
Mark, on this point one of the things my dad and I are going to tinker with is adding a 12v dimmer/rheostat to the wiring of the fantastic fan I just got for my Burro re-do. In theory it should offer more options for fan speed. I haven't yet starting digging around to find the gadget I'll need to make it happen.
Fantastic Vent recommends adding a 4 ohm, 10 watt resistor in series to slow the fan down, if desired. I did that but also added a switch to by pass the resistor if I desire, leaving me with effectively 6 speeds.
Attached Files
File Type: pdf TRBSHT 9 Layout1 (1)_SLOW DOWN FAN MOTOR.pdf (216.2 KB, 12 views)
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Old 02-10-2012, 04:53 PM   #8
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I just got this one. I'll report back on how it works after it is installed. Probably put the installation/pics in my "Updating '77 13' Trillium" thread.

Thanks for help- all y'all!
Amazon.com: Antec Big Boy 200 Tricool Fan 200Mm: Electronics
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Old 02-10-2012, 04:56 PM   #9
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Sorry, I got my ohms and watts confused.
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Old 02-12-2012, 11:19 AM   #10
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I've had the Fantastic Fan in mine, but changed to the Maxxfan because I wanted to be able to be able to leave it open in the rain without the restrictive cover I had put on it. The latest standard model of M. has about 9 speeds, several of which are on the low end, making it a lot more useful for me than the earlier version. It also can be used to circulate the inside air without actually having the vent open. The only 9x9 vent I know of is the Elixir, but after about 5 tries I had to admit it was on the low end of the construction quality scale.
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Old 02-12-2012, 06:04 PM   #11
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Originally Posted by Per Walthinsen View Post
I've had the Fantastic Fan in mine, but changed to the Maxxfan because I wanted to be able to be able to leave it open in the rain without the restrictive cover I had put on it. ...........
Just FYI, Fantastic Fan now has their own, non-restrictive cover allowing use in the rain.
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