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Old 04-30-2012   #1
 
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Default Truck cab air vents - please, shush-up....

There are two vents in the rear of the cab in my truck. They were a secret to me until recently. I have the rear bench seat out at the moment, and that's how I discovered the bastards. Those things are loud!

Is there a common fix for this - a baffle or such. Or, can I just kill them with some CDL.

Are they really necessary for ventilation? I don't want to suffocate and turn blue, but anything short of that is fine by me.

Thanks
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Old 04-30-2012   #2
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This will give you some of the pros and cons of sealing them...
Rear Wall Cabin Vents in Truck? SEAL OR NO??

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Old 04-30-2012   #3
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Default Re: Truck cab air vents - please, shush-up....

What's funny is I recently went back and really sealed up my IB setup as airtight as I could get it. I've also been complaining that I need to replace the cabin air filter because output is pretty bad. It didn't occur to me that it might have been from sealing the trunk off (which is where the vents are)from the cabin. I need to try it with a window down to see if it's the lack of vents that's causing it.

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Old 04-30-2012   #4
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When I had mine sealed up, output easily doubled on my AC when I cracked a window/ door.
The cab got so pressurized, you could hear the air being forced out of the seals.(from outside the truck) Lol yeah, had to fix that.

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Old 04-30-2012   #5
 
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Default Re: Truck cab air vents - please, shush-up....

Quote:
Originally Posted by jcollin76 View Post
This will give you some of the pros and cons of sealing them...
Rear Wall Cabin Vents in Truck? SEAL OR NO??
Thanks, I'm really thinking about throwing together some simple baffles then.

What did you end up with? Any tips on a design?

Quote:
Originally Posted by BuickGN View Post
What's funny is I recently went back and really sealed up my IB setup as airtight as I could get it. I've also been complaining that I need to replace the cabin air filter because output is pretty bad. It didn't occur to me that it might have been from sealing the trunk off (which is where the vents are)from the cabin. I need to try it with a window down to see if it's the lack of vents that's causing it.
The vents are bloody 7"X3"-ish. No wonder why there's so much noise in cabs. I just replaced my obnoxious muffler with a dynoflow turbo, too. It's MUCH nicer, but those vents have to be tamed.
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Old 04-30-2012   #6
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Honestly, haven't gotten to it yet. Plan was to address it when I pull the rear seat again. Haven't gotten that far...

Passenger vent is covered to help with exhaust noise. Driver side is open, and ill be messing with it in the future.

Noise is not as bad as open, and the pressure situation isn't as bad... but could be better.

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Old 04-30-2012   #7
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Default Re: Truck cab air vents - please, shush-up....

Quote:
Originally Posted by tulse View Post
Thanks, I'm really thinking about throwing together some simple baffles then.

What did you end up with? Any tips on a design?



The vents are bloody 7"X3"-ish. No wonder why there's so much noise in cabs. I just replaced my obnoxious muffler with a dynoflow turbo, too. It's MUCH nicer, but those vents have to be tamed.
I had a few paragraphs written but then I realized I forgot to ask the most basic question. These vents contain flappers that only let air travel out but not into the cab, right? Is the problem with outside noise getting in through the vents or is it the flappers making noise when the bass hits?

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Old 04-30-2012   #8
 
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Default Re: Truck cab air vents - please, shush-up....

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Originally Posted by BuickGN View Post
I had a few paragraphs written but then I realized I forgot to ask the most basic question. These vents contain flappers that only let air travel out but not into the cab, right? Is the problem with outside noise getting in through the vents or is it the flappers making noise when the bass hits?
It's outside noise that's the problem. The vents do look like they have flappy, one-way louvers, though. The vents are behind the trim. I'll pull it off and get a better look tomorrow.
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Old 04-30-2012   #9
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Default Re: Truck cab air vents - please, shush-up....

I wish I could help but I've never had a Car with vents in the cabin. You can always cover them up temporarily and see if it makes a difference. I can't imagine it making a huge difference though, they're normally closed unless the HVAC is being used. I'm interested to hear your results though.

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Old 04-30-2012   #10
 
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Default Re: Truck cab air vents - please, shush-up....

No problem. I appreciate it. Should be prety easy to do some trial and error stuff.
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Old 05-01-2012   #11
 
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Default Re: Truck cab air vents - please, shush-up....

I heard that these vents were also there to vent pressure during airbag deployment.
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Old 05-01-2012   #12
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I guess u need to look into it further too. But I completely covered mine when I Raammatted my truck. I actually just went right over them with a piece of raammat. I've noticed a quieter ride. And never noticed any extra noise with the AC on. And no airbag deployment yet so I can't vouch for that part.

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Old 05-01-2012   #13
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Default Re: Truck cab air vents - please, shush-up....

I'm sure they help with airbag deployment. However, my airbagless GN has roughly the same vent area as the TL. That probably means nothing though. For all I know it might mean the difference in blown eardrums. Hopefully my IB15s would have a little give in the event of airbag deployment but I'm sure they can't come close to covering the amount of volume the airbags displace.

I did try rolling the windows up and down with the fan on high today and there was no difference. I guess it really is just time to change the cabin filter.

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Old 05-02-2012   #14
 
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Default Re: Truck cab air vents - please, shush-up....

This should take care of that shouldn't it?

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Old 05-02-2012   #15
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Default Re: Truck cab air vents - please, shush-up....

The vents are there to equalize pressure, when you close a door, when you turn on the fan....ect....

Rip the flappy out or seal over it... you've got one of 2 choices..

Rip it out, run the risk of water/dust, cover it and pressurize the cabin constantly, I've done both...

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Old 05-02-2012   #16
 
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Default Re: Truck cab air vents - please, shush-up....

I'm going with option somewhere-in-the-middle.

Passenger side vent is getting covered. It's right over the muffler, basically. For the driver's side, I'll make a simple foam lined, right angle baffle. How does that sound? That should get rid of that high frequency wind sound, I'd guess.

I was actually mistake about the louvers. They do not move (are not hinged).
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Old 05-02-2012   #17
 
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Default Re: Truck cab air vents - please, shush-up....

what kind of truck? I know on mine (2010 F150) the "louvers" only move when you choose to blow aire NOT using the recycle air feature. when you use the recycle air feature, the louvers do not move at all....

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Old 05-02-2012   #18
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Default Re: Truck cab air vents - please, shush-up....

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what kind of truck? I know on mine (2010 F150) the "louvers" only move when you choose to blow aire NOT using the recycle air feature. when you use the recycle air feature, the louvers do not move at all....

Right, because on the "recycle" setting, you are recycling the air, not taking any from outside... .


Come on man, think a minute...

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Old 05-02-2012   #19
 
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Default Re: Truck cab air vents - please, shush-up....

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Originally Posted by Aaron'z 2.5RS/WRX View Post
Right, because on the "recycle" setting, you are recycling the air, not taking any from outside... .


Come on man, think a minute...
haha..i know that....


but the op said his didnt move...and i find it hard to believe that they dont...i have a feeling he tested it and looked while he had it in "recirculate " mode. I know when i had my back apart and had the air setting in normal mode it sounded like a freight train was back there.
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Old 05-24-2012   #20
 
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Default Re: Truck cab air vents - please, shush-up....

If someone figures out a way to quiet those things down, I'd love to hear it.

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Old 05-24-2012   #21
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Quote:
Originally Posted by Timelessr1 View Post
haha..i know that....


but the op said his didnt move...and i find it hard to believe that they dont...i have a feeling he tested it and looked while he had it in "recirculate " mode. I know when i had my back apart and had the air setting in normal mode it sounded like a freight train was back there.
Hahahaha troof...lol

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Old 05-24-2012   #22
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If someone figures out a way to quiet those things down, I'd love to hear it.
The way is here.. remove them or cover them...

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Old 05-24-2012   #23
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Default Re: Truck cab air vents - please, shush-up....

Its off topic but does anyone know the percentage of air that has to be fresh when in recycle? I knew it once but can't remember.

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Old 05-24-2012   #24
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Default Re: Truck cab air vents - please, shush-up....

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Its off topic but does anyone know the percentage of air that has to be fresh when in recycle? I knew it once but can't remember.
I didn't think any came in fresh on recycle, besides what leaks in/out through the "vent of hell"..

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Old 05-24-2012   #25
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Default Re: Truck cab air vents - please, shush-up....

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I heard that these vents were also there to vent pressure during airbag deployment.
highly doubt it.

They are there so that the heater/air conditioner can pull air into the cabin. good test if you have them sealed up. turn the "recirculate" on and see if volume increases alot.

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Eton
Farenheit
Fi Car Audio
Focal
Fusion
Genesis
Ground Zero
Hafler
Helix
Hertz
Hifonics
Hushmat
Image Dynamics
Infinity
Interfire
JBL
Jensen
JL Audio
JVC
Kenwood
Kicker
Knu Konceptz
Kole Audio
Kove Audio
Lanzar
Lightning Audio
Linear Power
MA Audio
Magnat
Marantz
Massive Audio
MB Quart
McIntosh
Memphis
Metra
Milbert
MMATS
Mobile Authority
Morel
MTX
Nakamichi
Niche Audio
O2 Audio
Ohio Generator
Optima
Orion
Oxygen Audio
OZ Audio
PG Audio
Phase Linear
Phoenix Gold
Pioneer
Polk
Power Acoustik
Powerbass
Powermaster
Precision Power
Profile
Pyle
Pyramid
RadioShack
Rainbow
Rampage
RE AUdio
Rockford Fosgate
Scanspeak
Scosche
Seas
Sony
soundstream
Sparkomatic
SPL Dynamics
Stinger
Sundown Audio
Swiss Audio
Targa
TC Sounds
TREO Engineering
TRU
Tsunami
Ultimate
US Acoustics
US Amps
Velodyne
Vifa
Viper
Visonik
Xtant
Zapco
Zed Audio
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