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11-09-2020, 02:00 PM
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#1
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Bus Nut
Join Date: Jul 2020
Location: Great Lakes
Posts: 307
Year: 2005
Coachwork: Thomas
Chassis: Freightliner
Engine: Cat C7 300/800
Rated Cap: 31
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Weird box on the roof of my 05 Thomas
Hey everyone.
I recently sealed up my roof hatches, and while I was on the roof, I discovered this weird box vented box. Its riveted to the roof and its vented. What concerns me is if I drill out the rivets, I will have to do something with it. But I dont know whats underneath. Anyone have any ideas?
Thanks in advance!
Peter
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11-09-2020, 04:43 PM
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#2
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Traveling
Join Date: Sep 2013
Location: Virginia
Posts: 2,302
Year: None
Coachwork: None
Chassis: None
Engine: None
Rated Cap: None
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Likely a simple vent to prevent heat and pressure from building in the interior and blowing out the glass. I would leave it be. If you remove it, you could be opening ths door to an unstoppabble roof leak.
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11-09-2020, 04:47 PM
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#3
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Bus Nut
Join Date: Jul 2020
Location: Great Lakes
Posts: 307
Year: 2005
Coachwork: Thomas
Chassis: Freightliner
Engine: Cat C7 300/800
Rated Cap: 31
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A vent, really ?
What caught my eye is, the base which is riveted to the bus, ISNT sealed very well to the skin of the bus, so water leakage would then be possible, so mold usually follows leakage, right?
Are you sure its a vent?
If that's the case maybe I should re-seal it like I did the emergency exit.
I'm just concerned about leaks, seepage, mold.
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11-09-2020, 04:52 PM
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#4
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Traveling
Join Date: Sep 2013
Location: Virginia
Posts: 2,302
Year: None
Coachwork: None
Chassis: None
Engine: None
Rated Cap: None
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I can't think of anything else it would be in that location. The outer shield doesn't necessarily need to be sealed, it only needs to keep rainwater out.
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11-09-2020, 07:02 PM
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#6
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,846
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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its a passive vent.. designed to suck heat / moisture out to helop with defrosting..
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11-09-2020, 08:19 PM
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#7
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Bus Geek
Join Date: Jan 2019
Location: Philadelphia
Posts: 7,000
Year: 2003
Coachwork: International
Chassis: CE 300
Engine: DT466e
Rated Cap: 65C-43A
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Quote:
Originally Posted by Peterjk
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I deleted mine a couple of months ago, for no particularly good reason (there was no sign of it leaking inside). I ripped it apart to see how it works, and here are some pics.
This is the bottom plate, how it would look if you were inside the bus looking up at it.
The bottom plate and the top vent cover are spot-welded together, which made this tough to get apart since I was trying to be quiet.
Inside is this arched plate which prevents any water that is blown in through the slats from being blown down through the round hole in the bottom plate. You can also see the four gutters in the corners of the bottom plate that allow any water to run out and onto the roof.
Since the plate is arched over the hole, air can still get in and out of the hole, but not water.
If that bottom plate is not sealed all the way around, this would let in a ton of water, but if it's properly sealed it looks like it's waterproof unless you're submerged.
Really a pretty cool design and I now regret deleting mine, since it would have continued to provide some ventilation to my cab area which is not part of my insulated living space. If this is going to be part of your heated (or cooled) living space, I'd say it's a somewhat significant conduit for heat transfer and you might want to delete it.
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11-09-2020, 10:19 PM
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#8
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Bus Geek
Join Date: Sep 2015
Posts: 3,856
Year: 2002
Coachwork: Thomas Built Bus
Chassis: Freightliner FS65
Engine: Caterpillar 3126E Diesel
Rated Cap: 71 Passenger- 30,000 lbs.
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I was not that curious when I removed mine.
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11-09-2020, 11:10 PM
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#9
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Bus Crazy
Join Date: May 2007
Location: Whidbey Island, WA.
Posts: 1,109
Year: 1984
Coachwork: Blue Bird
Chassis: All American
Engine: 3208 na boat anchor
Rated Cap: 2
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I was told that roof vent up by the driver was used to draw air forward and out so the driver could smell what the kids were burning.
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11-10-2020, 07:20 AM
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#10
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Skoolie
Join Date: Jan 2020
Location: Ohio
Posts: 224
Year: 2008
Coachwork: Thomas
Chassis: 0908S
Engine: Cummins 5.9
Rated Cap: 28' 9 window
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Quote:
Originally Posted by bus-bro
I was told that roof vent up by the driver was used to draw air forward and out so the driver could smell what the kids were burning.
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This one got me
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11-10-2020, 02:35 PM
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#11
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Bus Nut
Join Date: Jul 2020
Location: Great Lakes
Posts: 307
Year: 2005
Coachwork: Thomas
Chassis: Freightliner
Engine: Cat C7 300/800
Rated Cap: 31
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Quote:
Originally Posted by dwood443
This one got me
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Oh funny. Thanks for all this info, I'll leave mine till it start to leak I suppose.
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11-14-2020, 03:51 PM
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#12
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Mini-Skoolie
Join Date: Apr 2019
Location: RVA (Richmond, VA)
Posts: 22
Year: 1992
Coachwork: Thomas Built
Chassis: Saf-T-Liner MVP
Engine: CAT 3116 (TA185) / AT545
Rated Cap: 78
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Quote:
Originally Posted by Peterjk
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There should be a grill looking part on one of the ceiling panels.
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11-14-2020, 03:54 PM
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#13
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Bus Geek
Join Date: Sep 2018
Posts: 2,831
Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
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I deleted mine too.
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11-14-2020, 04:07 PM
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#14
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Bus Geek
Join Date: Jan 2019
Location: Philadelphia
Posts: 7,000
Year: 2003
Coachwork: International
Chassis: CE 300
Engine: DT466e
Rated Cap: 65C-43A
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Quote:
Originally Posted by BusWanderer83
There should be a grill looking part on one of the ceiling panels.
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If the ceiling panels are perforated, there won't be. There will just be a hole in the insulation underneath this vent.
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11-14-2020, 04:11 PM
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#15
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Mini-Skoolie
Join Date: Jul 2018
Location: Pensacola Fl
Posts: 35
Year: 1998
Coachwork: Thomas
Engine: International
Rated Cap: 7 Window 20 Passengers
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Quote:
Originally Posted by Peterjk
Hey everyone.
I recently sealed up my roof hatches, and while I was on the roof, I discovered this weird box vented box. Its riveted to the roof and its vented. What concerns me is if I drill out the rivets, I will have to do something with it. But I dont know whats underneath. Anyone have any ideas?
Thanks in advance!
Peter
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It's a vent i would maybe seal it with some clear caulk not sure why you would seal up your emergency hatches... I used one of mine for a roof-top air unit & may put another one in as well they are perfect for those & great for parked camping with external power or even generator power on super hot days but then again I have the original ceiling in mine. We use it for a promotional vehicle for our DJ & event company as well as a camper. Not living in the thing.
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11-14-2020, 07:06 PM
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#16
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New Member
Join Date: Aug 2019
Location: Connecticut
Posts: 6
Year: 2003
Chassis: Fs65
Engine: Cat 3126
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We removed that vent on our bus, the hole was filled with a fantastic fan. We did this because there is no way to close that vent off.
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11-14-2020, 09:46 PM
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#17
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Bus Nut
Join Date: Jul 2019
Location: Freedom Field, New Mexico
Posts: 459
Year: 1998
Coachwork: International
Chassis: Amtrans
Engine: 444E
Rated Cap: 84 pas
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Quote:
Originally Posted by Peterjk
Hey everyone.
I recently sealed up my roof hatches, and while I was on the roof, I discovered this weird box vented box. Its riveted to the roof and its vented. What concerns me is if I drill out the rivets, I will have to do something with it. But I dont know whats underneath. Anyone have any ideas?
Thanks in advance!
Peter
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Got the same thing on ours. It is a vent. Look on your ceiling you should find an adjacent vent.
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11-14-2020, 10:32 PM
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#18
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Bus Nut
Join Date: Dec 2018
Location: Mt Vernon, WA
Posts: 523
Year: 1996
Coachwork: Bluebird, Collins
Chassis: G30 Bluebird Microbird, E350 Shuttle Bus
Engine: 1995 Chevrolet 350, 1992 Ford 460
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Seems like I could loose precious heat from my vent. I better check it out and plug it. Does that mean I won’t know if Im burning my dinner.
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11-15-2020, 07:21 AM
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#19
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Bus Crazy
Join Date: Mar 2017
Location: arkensas
Posts: 1,080
Year: 1997
Coachwork: bluebird
Chassis: chevy
Engine: 3116 catapillar
Rated Cap: 71 now 2 humans 1 cat
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most roof escape hatches can be opened from the outside so you have no security from them. the vent will leak in a hard rain if pointed wrong i deleted the vent and 1 hatch. the other hatch ill modify so it can not be opened from the outside
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11-15-2020, 08:03 AM
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#20
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Mini-Skoolie
Join Date: Apr 2019
Location: RVA (Richmond, VA)
Posts: 22
Year: 1992
Coachwork: Thomas Built
Chassis: Saf-T-Liner MVP
Engine: CAT 3116 (TA185) / AT545
Rated Cap: 78
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Do you have a pic? Mine looked like a heat register but the ceiling panel was all one piece...just curious
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