Home » Public Forums » GMCnet » Crank Up Roof Vents
| Crank Up Roof Vents [message #207181] |
Wed, 08 May 2013 16:39  |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Senior Member |
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Are the crank up vents the standard 14"X14" size? What about the Roof Air opening?
My plan is to re-seal all of the roof openings and penetrations. I want to buy all new vents for the fridge and bath vents, etc.
Since the roof is aluminum, do I just re-seal with silicone?
What kind?
Do I need to use some kind of roof coating (Snow Coat)?
Thanks,
Steve
PS I would measure mine except the coach isn't here yet.
75 26' GMC Glenbrook
Puyallup, Washington
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| Re: Crank Up Roof Vents [message #207184 is a reply to message #207181] |
Wed, 08 May 2013 17:01  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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depends on your coach.
normal square vents are mostly the 14x14 and they are pretty standard. I switched one out the other year from original one, and i did have to cut like an 1/8 inch. pretty easy to cut with the right jig saw blade.
my original fan in the bath is a round hole, that one is sorta unique.
the fridge is not 14x14.
I believe the roof air openings are standard size as well.
they sell the correct sealant in a caulk tube at most RV places.
for parts:
www.appliedgmc.com
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Crank Up Roof Vents [message #207210 is a reply to message #207181] |
Wed, 08 May 2013 22:09 |
Galen
Messages: 146
Registered: November 2011
Location: New Virginia, IA
Karma: 0
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Senior Member |
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I used butyl rubber tape from my local RV dealer to seal my two fantastic fans. I had to trim the corners square with some tin snips for the fantastic fan to fit; the original hammond fan had rounded corners. The rubber tape is easy to use and not messy at all. Make sure anyone you get advice from on sealants knows you are dealing with the GMC/aluminum and not a standard RV or camper.
Galen Briggs
New Virginia, Iowa
1978 Palm Beach
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| Re: [GMCnet] Crank Up Roof Vents [message #207217 is a reply to message #207197] |
Thu, 09 May 2013 06:36 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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The roof vents are standardized at 14x14", the original 2 crank Hammond vents are also that size but as he said, you have to square out the opening by taking the radius out. We use RTV silocone, not the bath tub smelly stuff, it does not stick which is what many people are used to. RTV (neutral cure) silocone has sealing as well as adhesive qualities. Dow-Corning 791 is black RTV, 999 is clear. We use a product made by Dow-Corning.
We used to install a blue million of the Fantastic fans and they were. The day though that the "Maxvent" came out, Fantastic sold out to Dometic and their reigh was over. The Maxvent can be left open in the rain which is a huge advantage! Yea, one model of the Fantastic fan will close in rain but it pulls @ 500ma in that mode so you can't just leave the coach in a storage lot with that function on. Besides, not letting water in during a rain is just so dang nice!
There is nothing wrong with a Fantastic Fan, I just really like the new feature of leaving the vent open about all the time. I feel RTV is a better choice sealer than butyl tape, that stuff have body and will hold the vent off the aluminum, if a void occures there will be a leak. Just my opinion.
Check out the Maxvent model, very cool...
Jim Bounds
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________________________________
From: Mike Miller <m000035@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, May 8, 2013 9:29 PM
Subject: Re: [GMCnet] Crank Up Roof Vents
quadracerx1 wrote on Wed, 08 May 2013 14:39
> Are the crank up vents the standard 14"X14" size? What about the Roof Air opening?
>
> My plan is to re-seal all of the roof openings and penetrations. I want to buy all new vents for the fridge and bath vents, etc.
>
> Since the roof is aluminum, do I just re-seal with silicone?
>
> ...
Some have more rounded corners... depending on the year and model. (See my note in your other thread.)
If possible, avoid silly-cone. Others can give you the name of better "paintable" sealants. I have to go to work. :?
--
Mike Miller -- Hillsboro, OR -- on the Black list
(#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
http://m000035.blogspot.com/
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| Re: [GMCnet] Crank Up Roof Vents [message #207229 is a reply to message #207227] |
Thu, 09 May 2013 09:12 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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You can buy vent covers that allow you to leave the air vents open in all weather. Even though Fantastic does not recommend them, I have one on each of my air vents. Works just fine. I leave the vents open all the time, keeps the coach aired out, which is my intent. Easy to install, totally passive in nature.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Crank Up Roof Vents [message #207232 is a reply to message #207229] |
Thu, 09 May 2013 09:46 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Tom,
I bought two of the covers you speak of which I believe are made by Maxx Fan to install on The Blue Streak in Aus. When the Maxx Fan
came out I decided they looked a lot better than those covers so I bought two of them.
I'll flog the Maxx covers.
One of the Fantastic fans will go into the bathroom with a smoke cover and brighten it up a lot.
Regards,
Rob M.
-----Original Message-----
From: Thomas Phipps
You can buy vent covers that allow you to leave the air vents open in all weather. Even though Fantastic does not recommend them, I
have one on each of my air vents. Works just fine. I leave the vents open all the time, keeps the coach aired out, which is my
intent. Easy to install, totally passive in nature.
Tom, MS II
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Crank Up Roof Vents [message #207233 is a reply to message #207181] |
Thu, 09 May 2013 09:50 |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Thanks everyone, I'm on the hunt for the PL Polyurethane Door, Window and Siding Sealant now... LOL
Steve
75 26' GMC Glenbrook
Puyallup, Washington
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| Re: [GMCnet] Crank Up Roof Vents [message #207291 is a reply to message #207233] |
Thu, 09 May 2013 23:19 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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The Maxx Fan is what were selling after Fantastic shoved 5 warrenty claims
when they were bought out by another company.
Maxx fan delux unit when not opened is as low profile as the Fantastic and
when raised, it still looks sleak, not the Camper style look of the add on
hood.
On Thu, May 9, 2013 at 7:50 AM, Steve <quadracerx@aol.com> wrote:
>
>
> Thanks everyone, I'm on the hunt for the PL Polyurethane Door, Window and
> Siding Sealant now... LOL
>
> Steve
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Crank Up Roof Vents [message #207297 is a reply to message #207291] |
Fri, 10 May 2013 06:18 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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Everything has a beginning and end and it looks like the Fantastic fan has been toppled from it's superiority perch. The way it goes, along with being able to have peace of mind leaving the vent open (if you have ever left your Fantastic fan open in the rain you know what I mean) the styling, as Jim K. pointed out, is really fresh looking. You can reverse blade direction without having to wait for the fan to stop turning or blowing the fuse in the unit, it has touch controls. We are "blacking out" the roof AC cover along with other roof mounted things so one of these vents with a smoke cover really looks great.
On the sealing material point a minute, I appreciate folks feelings about "silocone" but I must tell you all silocones are not created equal. The acid cure tub sillycone should not come near a motorhome but the neutral cure "RTV" silocone is much different. RTV, yea a similar product thats used on engine gaskets, has not only sealing but also adhesive qualities. The stuff is used in many commercial applications to include roof axpansion joint membrane sealing and securing. It's easy to knock silocone because of the bad wrap it has attracted plus folks use it for everything -- usually the wrong thing. I will not allow acitoxic silocone on the property, just it's fumes will fisheye my painter efforts but neutral cure RTV is very different. So don't lump all silocones into a bag for bad goopage, RTV silocone has many positive used in RV application.
We seal these roof vents with RTV silocone and would recommend other people doing the same, I don't think you can find it at Home Depot or places like that. If you cut the top off a tube and it has an acid smell-- it's not the right stuff. Neutral cure RTV has no smell. Dow/Corning 791 is black, 999 is clear. We get the stuff through a commercial wholesale supplier. It's $6 a tube and yes, I can ship it.
Jim Bounds
----------------------
________________________________
From: Jim Kanomata <jimkanomata@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Friday, May 10, 2013 12:19 AM
Subject: Re: [GMCnet] Crank Up Roof Vents
The Maxx Fan is what were selling after Fantastic shoved 5 warrenty claims
when they were bought out by another company.
Maxx fan delux unit when not opened is as low profile as the Fantastic and
when raised, it still looks sleak, not the Camper style look of the add on
hood.
On Thu, May 9, 2013 at 7:50 AM, Steve <quadracerx@aol.com> wrote:
>
>
> Thanks everyone, I'm on the hunt for the PL Polyurethane Door, Window and
> Siding Sealant now... LOL
>
> Steve
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com/
1-800-752-7502
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| Re: Crank Up Roof Vents [message #207301 is a reply to message #207181] |
Fri, 10 May 2013 07:10 |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Senior Member |
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I just replaced the OEM front vent with the Maxxair crank up fan, the installation is quite easy, I like the fact the base ring goes in first, then the canopy/fan assembly screw to the base. I used putty tape, however I filled the existing/new screw holes with acrylic caulk prior to installation. The corners of the Maxxair are rounded, so the 4 corner screw holes are exposed, I just gooped up ss screws with caulk and installed in the corners.
I like the thermostat setting.
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
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| Re: [GMCnet] Crank Up Roof Vents [message #207304 is a reply to message #207297] |
Fri, 10 May 2013 08:11 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
I reckon the Fantastic Fans are still OK to put in a bathroom, you can't leave them open in a rainstorm but you can leave them
cracked an inch or so and they'll keep the bathroom mirror from fogging up.
At least that's what I'm going to do with the ones I remove from both my GMC's.
Regards,
Rob M.
-----Original Message-----
From: Jim Bounds
Everything has a beginning and end and it looks like the Fantastic fan has been toppled from it's superiority perch. The way it
goes, along with being able to have peace of mind leaving the vent open (if you have ever left your Fantastic fan open in the rain
you know what I mean) the styling, as Jim K. pointed out, is really fresh looking. You can reverse blade direction without having
to wait for the fan to stop turning or blowing the fuse in the unit, it has touch controls. We are "blacking out" the roof AC cover
along with other roof mounted things so one of these vents with a smoke cover really looks great.
On the sealing material point a minute, I appreciate folks feelings about "silocone" but I must tell you all silocones are not
created equal. The acid cure tub sillycone should not come near a motorhome but the neutral cure "RTV" silocone is much different.
RTV, yea a similar product thats used on engine gaskets, has not only sealing but also adhesive qualities. The stuff is used in
many commercial applications to include roof axpansion joint membrane sealing and securing. It's easy to knock silocone because of
the bad wrap it has attracted plus folks use it for everything -- usually the wrong thing. I will not allow acitoxic silocone on
the property, just it's fumes will fisheye my painter efforts but neutral cure RTV is very different. So don't lump all silocones
into a bag for bad goopage, RTV silocone has many positive used in RV application.
We seal these roof vents with RTV silocone and would recommend other people doing the same, I don't think you can find it at Home
Depot or places like that. If you cut the top off a tube and it has an acid smell-- it's not the right stuff. Neutral cure RTV has
no smell. Dow/Corning 791 is black, 999 is clear. We get the stuff through a commercial wholesale supplier. It's $6 a tube and
yes, I can ship it.
Jim Bounds
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Crank Up Roof Vents [message #207311 is a reply to message #207304] |
Fri, 10 May 2013 09:30 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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If anyone has a discount on a used good fantastic fan for my bathroom, let me know. mickey anaheim ca. 77 palm beach.
On May 10, 2013, at 6:11 AM, Rob Mueller wrote:
> G'day,
>
> I reckon the Fantastic Fans are still OK to put in a bathroom, you can't leave them open in a rainstorm but you can leave them
> cracked an inch or so and they'll keep the bathroom mirror from fogging up.
>
> At least that's what I'm going to do with the ones I remove from both my GMC's.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Jim Bounds
>
> Everything has a beginning and end and it looks like the Fantastic fan has been toppled from it's superiority perch. The way it
> goes, along with being able to have peace of mind leaving the vent open (if you have ever left your Fantastic fan open in the rain
> you know what I mean) the styling, as Jim K. pointed out, is really fresh looking. You can reverse blade direction without having
> to wait for the fan to stop turning or blowing the fuse in the unit, it has touch controls. We are "blacking out" the roof AC cover
> along with other roof mounted things so one of these vents with a smoke cover really looks great.
>
> On the sealing material point a minute, I appreciate folks feelings about "silocone" but I must tell you all silocones are not
> created equal. The acid cure tub sillycone should not come near a motorhome but the neutral cure "RTV" silocone is much different.
> RTV, yea a similar product thats used on engine gaskets, has not only sealing but also adhesive qualities. The stuff is used in
> many commercial applications to include roof axpansion joint membrane sealing and securing. It's easy to knock silocone because of
> the bad wrap it has attracted plus folks use it for everything -- usually the wrong thing. I will not allow acitoxic silocone on
> the property, just it's fumes will fisheye my painter efforts but neutral cure RTV is very different. So don't lump all silocones
> into a bag for bad goopage, RTV silocone has many positive used in RV application.
>
> We seal these roof vents with RTV silocone and would recommend other people doing the same, I don't think you can find it at Home
> Depot or places like that. If you cut the top off a tube and it has an acid smell-- it's not the right stuff. Neutral cure RTV has
> no smell. Dow/Corning 791 is black, 999 is clear. We get the stuff through a commercial wholesale supplier. It's $6 a tube and
> yes, I can ship it.
>
> Jim Bounds
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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