Ventilation without power - Page 2 - Fiberglass RV


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Old 07-30-2013, 07:54 AM   #15
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Install an awning too.
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Old 07-30-2013, 08:05 AM   #16
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Originally Posted by Cat futrell View Post
Even with a fantastic fan the air will travel between the windows in the rear and the ceiling hatch where the fan installs. this leaves the front of the cabin with no circulation.
Air flow is not so linear. You don't have to install a fan to see it. Temporarily place a fan on the roof so it is sucking air from the roof vent. Open your windows, step inside, close the door and light a cigarette. Watch which way the smoke goes as you move around the trailer.

Yes, the flow in the front should be less than where there is a direct line between the window and vent. The direct line flow creates currents elsewhere. Less air flow does not mean dead air space.
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Old 07-30-2013, 08:05 AM   #17
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All,

Good to read everything from everyone.

I am a charter member of a "floating society" and I have been on the annual float trip 36 of the 42 years. In the early years I slept on the ground and later graduated to a tent and a therma-rest. Now, I use the Boler. Much, much easier, quicker, and more comfortable. While I use the Boler year-round this float trip is really the only extended (7 days or so) camp totally off grid. I have access to a generator but it kind of defeats the whole total immersion in nature thing (yeah, I know....I AM in a camper but still). The weather here in Missouri is extremely variable during the first of June and can range anywhere on the scale. This year the Boler and tow vehicle were on the highest spot and completely surrounded by flood waters ( Yeah, I should have known better)....other years I have been a hundred yards from the river. Temperatures have been as high as the upper, upper 80's at night.

As for fans; I have the Coleman tent ceiling fan. I use the magnetic base on the screen of the Boler's roof vent and turn it on low or high. It does a great job of pulling in the cool night air and four of us have always slept comfortably. The fan runs on D batteries and if the grandsons remember to turn it off the batteries will last the entire trip running the fan on high during the night. It also has a small, glowing night light that we keep on and still the batteries will make it thru the week (again, providing it is off during the day). I am not saying it is a perfect solution but it works for me. It is cheap but it would be nice if it could be reversed for exhaust as well as intake.

A couple of caveats..... during this trip I use the camper mainly as an easy to set up tent so only for sleeping..........AND that Ozark Moonshine helps you sleep regardless of the temperature ;-)

Just kidding about the last statement. Retiring at 0100 hours after an evening spent with old, old friends I have always slept well.

Borders of Clan Cumming

"Riot? What Riot? I just rode into town and saw all these cars burning and thought I would stop to help.........." a line from some unknown actor in a 1960-s "B" biker flick.
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Old 07-30-2013, 09:02 AM   #18
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I use a fan, two speed, two C batteries, cost about $10 @ Target. Moves air well. Margaret
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Old 07-30-2013, 09:40 AM   #19
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On my 13 Scamp I put a fantastic fan in the front roof area and still have the factory escape hatch in the back area. With both vents open and the fan off there is a very good uplift between the 2 vents allowing heat to readily escape. I have an opening window in the door and a vent behind the stove in the front area. There are 3 opening slider windows in the sides of the trailer and in the rear sleep area. And of course with the door open and screen door provides even more. I have not had to leave the door open yet and if it cools down any at night I haven't had to run the fantastic fan. Out here in southern california we dont usually battle heat and humidity at the same time so all is working well. I use 2 small 30 watt solar pannels to keep my battery up to snuff. I haven't camped at a site yet that has 120 volt. this is my first spring/summer with this trailer. I am a happy camper with the way its working out.
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Old 07-30-2013, 09:50 AM   #20
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Originally Posted by Byron Kinnaman View Post
Almost all trailers I've been in that have a ceiling fan (Fantastic Fan or MaxxAir) don't get enough air through the without the fan running. As Carol says she has to keep it running most of the time.
I suspect my comment that I keep my fan on low was a bit misleading. What I meant to convey was I run the fan on low, as when its on high it moves to much air. I don't normally keep the fan running at night - not even when camping in the temps of high 90's to 100's as I was this week. I just keep all the windows and roof vents open.
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Old 07-30-2013, 11:28 AM   #21
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Originally Posted by Cat futrell View Post
I am guessing that this is an issue for most, which is the reason that Fantastic Fans are so popular. Even with a fantastic fan the air will travel between the windows in the rear and the ceiling hatch where the fan installs. this leaves the front of the cabin with no circulation.

We have a 13' Love Bug - 2 rear side windows that open and a ceiling vent. No window in the door. When we boondock we don't have power to run a fan (yet).

my question is...does anybody have a vent in the front end of your cabin that can be opened or closed to allow for a cross draft from front to back? If so please share. I am hoping not to reinvent the wheel if someone else has already addressed this issue.
Cathy in florida its going to be hot in the summer. I would head to walmart and for about $70 you can get a marine deep cycle battery and for about $8 a 12 volt socket with 2 alligator clips to clip on the battery and have power for a fan. I couldn't imagine camping in the heat without something to move the air around. My last few years of tent camping I used the marine battery and a small "trucker fan" that plugged into the socket...they sell them at walmart as well as some larger auto parts stores. Made camping in the humidity alot more bearable.
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Old 07-30-2013, 02:19 PM   #22
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While I can't offer a non powered solution, even with minimal 12V battery power you can run RV ceiling fans. I have the Maxxfan Deluxe, Model 5100K. While it draws 4 amps on high, on the lowest setting only about .2 amps. Still moves quite a bit of air on low, and is almost silent. A couple of advantages of this fan - it has a built in shroud so it can be left on in the rain. It can be operated manually at any of the 10 available speeds, or switched to the thermostat mode where as the trailer temperature goes up the fan speeds up. Great for keeping the inside temperatures down with the minimum amount of power while you are away.

It wouldn't take all that much in the way of solar to keep the battery up if the fan is all you use. I have a 95 watt panel & power many other things, including the fan with no problems.
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Old 07-30-2013, 02:28 PM   #23
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Originally Posted by mary and bob View Post
The Walmart fan I saw was square, 10 or 12 inches, and had a base that folded. Batteries were in the base I believe. I don't know how long he has had it. Sometimes with Walmart after they sell out an item they don't restock.
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Originally Posted by Ed Harris View Post
Actually if the fan from Walmart is the same as I found it also has an input jack for external power!
I have mine rigged to plug right into 12vdc on a lighter plug and it will run forever on a battery jumping pack or the trailers lighter plug.

They are really a nice little fan.
Yup O2Cool..... The one with the separate battery case is a newer version than mine. Raz
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Old 07-30-2013, 06:05 PM   #24
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Originally Posted by deryk View Post
Cathy in florida its going to be hot in the summer. I would head to walmart and for about $70 you can get a marine deep cycle battery and for about $8 a 12 volt socket with 2 alligator clips to clip on the battery and have power for a fan. I couldn't imagine camping in the heat without something to move the air around. My last few years of tent camping I used the marine battery and a small "trucker fan" that plugged into the socket...they sell them at walmart as well as some larger auto parts stores. Made camping in the humidity alot more bearable.
What deryk suggests was also my thought, battery can drive a small fan OR charge your camera or cell phone or laptop. And if you camp without power your going to want a battery eventually. $70 expense that is a long term investment.

Might add a small battery charger to items deryk suggested.

Best solution long term is one of the 12 volt Fantastic/MaxxAir vent fans, going to need a battery for that anyway.

An actual deep cycle battery (as opposed to a marine starting/deep cycle) will typically deliver better service as an RV electric source.

Consider a typical Group 27 110 amp hour deep cycle can deliver 1 amp for 55 hours before being discharged to the recommended max of 50% discharge. Or 2 amp for 27.5 hrs.

Assuming you get 8 hrs sleep and left the example 12 inch fan from the link on all night on a low setting you can expect three nights use without recharge. On high (max 3 amp draw) you might only get a single 8 hour night.

http://www.campingworld.com/shopping/item/fan-tastic-endless-breeze-12v-fan/38132
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Old 07-30-2013, 06:13 PM   #25
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There is always one of these, for the price of a bag of ice you have about 4 hours of chill, works like a charm.
Amazon.com: 12 Volt 12v Portable Air Conditioner for Ice Cooler Chest: Automotive
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Old 07-31-2013, 11:39 AM   #26
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Door, rain, NO PROBLEM!
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Old 07-31-2013, 12:55 PM   #27
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I haven't had time to install a battery on the trailer yet, so I us a 12 volt .28 amp computer fan run off a 9 volt battery. I have one in the roof vent and one to help the propane cooler on hot days.

I have also looked a solar vents for boats, they are small, some close and some stay open all the time. No need for batteries or wires. I found one on the home depot website, haven't researched it yet, so can't say either way.

With lots on the to do list for now I have left this for later, interesting reading through everyone's solutions, the best part about delaying is often a better option is found.
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