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Old 09-13-2008, 10:34 AM   #1
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Heater duct Hose color ??

How come the heater hose that comes from the furnace to the ducts on the wall of my sunline are "grey" and 'tinfoil" looking. The one going to the duct in the bathroom is grey, and the one going to the kitchen/dining area looks like tin foil in color. Just curious why the 2 different color? Any info appreciated.

Thanks
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Old 09-15-2008, 09:21 PM   #2
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Yes there are 2 styles of ducts like you said and they are physically made different.

Here is a pic from one of mine on the T2499


I really do not know the exact reason but the longer runs are from the gray cloth wrap type duct and the shorter runs are from the foil type. On my larger TT (T310SR) the long runs are really long and are the gray cloth type.

It "might" be the longer runs of the cloth type are sort of more insulated and do not radiate off as much heat off the side of the duct letting all more of he heat make it to the end to blow into a room a long place away. And they may cost more because of it but are needed on the long runs. The shorter runs of the tin foil may convect off heat but my not be a problem on short runs as the heat is going into that space soon anyway.

This is a good question. I never thought about this until now and really do not know the exact right answer but I'm now a curious number 2 Sunline inquirer.

John
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Old 09-16-2008, 06:09 AM   #3
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John

Your right the longer run is the gray one, probably better insulated as you indicated. Don't know why I didn't put 2 and 2 together.

Maybe someone else will chim in.

thanks
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Old 09-16-2008, 06:28 AM   #4
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JohnB:

I also agree. It does make sense to insulate the longer runs and the cloth cover would do exactly that. I wonder if any other manufacturer would go to that extreme detail to be sure that the heating system worked well.
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Old 09-16-2008, 06:37 AM   #5
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This may help:

http://www.thermaflex.net/thermaflex.php This is the brand that is used in my rig.

I pulled the manufacturer's sticker off of a run of the foil stuff in our TT, and it states "FOR INSTALLATION IN LENGTH NOT OVER 14 FEET."

The online spec sheet for the foil stuff doesn't really give a max. length limit, but does say the stuff comes in 25' pieces.

The spec sheet for the gray stuff specifically says it's not limited in length of use like the foil stuff. Guess that means it is good for longer runs as in your TT's. Probably costs more, too.

Neither are insulated. Both are spec'd from -20 F to 250 F. They specifically mention residential bathroom vent runs in the product sheets so I am pretty sure this is the exact same stuff you'd buy at Home Depot, etc. for bathroom vents or dryer vents.
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Old 09-16-2008, 08:32 AM   #6
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In my case the non insulated (tin foil) looking stuff. Just happens to run under my kitchen sink and over the fresh water tank. Might help keep them from freezing with the furnace running, during fairly cold temps.
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Old 09-16-2008, 09:41 AM   #7
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Quote:
Originally Posted by Sunline1
In my case the non insulated (tin foil) looking stuff. Just happens to run under my kitchen sink and over the fresh water tank. Might help keep them from freezing with the furnace running, during fairly cold temps.
Mine originates in the same compartment with the fresh water tank, and passes the city water intake and pipes and then all of the bathroom sink and outside shower plumbing. I suspect that in really cold weather, the radiated heat from the ducting would do a great job of keeping all of these areas very warm.

I am guessing that the gray ducting probably radiates heat, too, but since it is a fiberglass cloth instead of metal foil, I can't say if it radiates much differently than the foil. The manufacturer says it is not insulated, but I suspect the cloth has a tiny bit of insulation factor. Probably not enough to matter for our purposes.
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