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Old 04-22-2009, 11:09 PM   #1
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Why does the fan / vent pop open during travel?

I thought i saw this post once before. I cant find the solution to this phenomenon. After a few hours of towing I find that the bathroom fan / vent has popped up? I pull it down as t seems like it has plenty of spring pressure against it and once again i find it popped up .

Whats the deal? I hope i dont hear about running gear... I had all that done. Anyone ??

Thanks Vinnie
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Old 04-23-2009, 01:48 AM   #2
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Wild guess?

Hi, maybe if you tow your trailer with an open window and the pressure builds up, pop goes the bathroom vent.
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Old 04-23-2009, 05:48 AM   #3
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that was me!

maybe you saw my posting?
http://www.airforums.com/forums/f455...tow-41588.html

we had to replace a 17$ part in the fan and it hasn't happened again. 2airishuman provided the info i needed (miss his posts!).
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Old 04-23-2009, 09:07 AM   #4
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Hello Robert,

Thats something i didnt think of.. pressure in the fusalage.. Hmm.

The fan that im speaking of is a small round one. The handle pushes up the whole outside cover. I dont think it should be a problem if its open while traveling but strange that it happens.

Vinnie
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Old 04-23-2009, 09:42 AM   #5
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Quote:
Originally Posted by ROBERTSUNRUS View Post
Hi, maybe if you tow your trailer with an open window and the pressure builds up, pop goes the bathroom vent.
I don't recommend towing with any windows open..Period
All too often, owners have lost a window for that very reason..
Why the bathroom vent pops open, is extremely odd.
I'd try a manual latch of sorts to prevent it.
Good luck~!
Be sure to follow up a report on what the final cause and, cure is.
ciao
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Old 04-23-2009, 10:07 AM   #6
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It may be as simple as forgetting to close the stove vent. Any air pressure that builds up inside will have to vent somewhere and the bathroom vent IS cheaper than breaking out a window because of air pressure. Also make sure your fantastic fan(s) are OFF when you tow - speed 0 and lid down - if they are just closed due to the rain sensors detecting moisture, they could open during transport and start sucking air into the coach.

Paula
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Old 04-23-2009, 11:01 AM   #7
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I thought i saw this post once before. I cant find the solution to this phenomenon. After a few hours of towing I find that the bathroom fan / vent has popped up? I pull it down as t seems like it has plenty of spring pressure against it and once again i find it popped up .

Whats the deal? I hope i dont hear about running gear... I had all that done. Anyone ??

Thanks Vinnie
Try some Centramatic balancers.

The wind current has nothing to do with that cover opening.

Since it only opens in transit, then vibration can be the only cause.

Andy
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Old 04-23-2009, 04:08 PM   #8
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Try some Centramatic balancers.

The wind current has nothing to do with that cover opening.

Since it only opens in transit, then vibration can be the only cause.

Andy

Hmmm.. I thought you might say that..

Thanks Andy.
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Old 04-23-2009, 04:17 PM   #9
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Hmmm.. I thought you might say that..

Thanks Andy.
Please remember, that moment arm increases with distance.

What ever vibration may be at the wheels, it increase the further rearward you become from those wheels.

I didn't say it, by try riding in the area of the vent at 50 or 60 mph.

It could be enlightening for you.

Andy
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Old 04-23-2009, 06:37 PM   #10
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Quote:
Originally Posted by Inland RV Center, In View Post
Please remember, that moment arm increases with distance.

What ever vibration may be at the wheels, it increase the further rearward you become from those wheels.

I didn't say it, by try riding in the area of the vent at 50 or 60 mph.

It could be enlightening for you.

Andy
Funny you should say that. I had my son who is 20 ride in the trailer down the freeway (i know its not legal but just wanted to know) He was green by the way once out.. He said he put a glass of water open on the table and it didnt even spill.. no vibration.. felt like you were flying in an airplane. He didnt like the curves however once in the neighborhood.
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Old 04-28-2009, 07:15 AM   #11
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well, i wondered what it would be like inside the trailer when towing - now i know!

are you sure the fan gear isn't warped? i know i'm not saying it properly but the teeth in our fan didn't align and, even though the fan closed properly, it would pop up when towing or in a strong wind. An easy fix - apparently from over tightening it when closing.
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Old 04-28-2009, 09:55 AM   #12
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Riding in a travel trailer is not illegal in all states, so your son can enjoy many hours of watching that glass of water in the right (or wrong) places.

Gene
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Old 04-28-2009, 10:06 AM   #13
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Please remember, that moment arm increases with distance.

What ever vibration may be at the wheels, it increase the further rearward you become from those wheels.

I didn't say it, by try riding in the area of the vent at 50 or 60 mph.

It could be enlightening for you.

Andy
I rode in the trailer right before we switched the factory unbalanced running gear for a balanced disc brake set up.

Before, I needed a seat belt. Not only did it bounce me around. The trailer made a whole lot of unpleasant noises.

After, Nice smooth ride and a lot less noise.
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Old 04-28-2009, 10:22 AM   #14
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I rode in the trailer right before we switched the factory unbalanced running gear for a balanced disc brake set up.

Before, I needed a seat belt. Not only did it bounce me around. The trailer made a whole lot of unpleasant noises.

After, Nice smooth ride and a lot less noise.
Where did you get the disks balanced?

I'll have to admit that I was appalled when I learned about the need to static balance the wheel/brake assembly. (Thanks Andy, I can see the evidence of out of balance running gear in my Trade Wind, but that was prior the the Internet, much less the forum. I know what to look out for now.)

If all the auto makers in the world can balance their brake/hubs, why can't trailer axle makers? They are certainly not bargain priced.
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