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12/05/09, 02:24 PM
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Join Date: May 2002
Location: missoula, montana
Posts: 1,407
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how hot for duct tape
Just as you leave the furnace that air is probably pretty hot. And after running for 20 minutes straight - the metal gets hotter still.
How hot are we looking at here? How hot is duct tape rated for? And since gorilla tape is supposed to be improved duct tape, do they take heat into consideration?
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12/05/09, 02:34 PM
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Appalachian American
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Join Date: Oct 2005
Location: SW VA
Posts: 10,637
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I don't know a specific temp, but duct tape gets soft and very tacky with heat. I'd use the metal foil tape rather than duct tape. I've never used gorilla tape, so I can't give you any help there.
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12/05/09, 02:45 PM
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Join Date: May 2002
Location: missoula, montana
Posts: 1,407
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To answer my own question: I found something called "aluminum flue tape" that is rated to 600 degrees!
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12/05/09, 02:50 PM
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Appalachian American
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Join Date: Oct 2005
Location: SW VA
Posts: 10,637
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Quote:
Originally Posted by Paul Wheaton
To answer my own question: I found something called "aluminum flue tape" that is rated to 600 degrees!
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That would be the one to use.
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12/05/09, 03:59 PM
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Join Date: Feb 2007
Location: Wisconsin
Posts: 964
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Duct tape should never be used on... ducts. Actually, its originally called Duck Tape.
One of the national HVAC associations did a study about using tapes to seal duct work. Duct/Duck tape leaks more than any other, and it has a short life before it comes apart.
The aluminum tape is the recommended tape. More expensive, but its designed for what you need. We're talking decades here, vs. the duck tapes several years of life.
Michael
P.S.: are you talking about the flue, or the hot air out? Hot air shouldn't be more than 200degF, and probably closer to 150degF max.
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12/05/09, 04:10 PM
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Join Date: May 2002
Location: missoula, montana
Posts: 1,407
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Quote:
Originally Posted by artificer
P.S.: are you talking about the flue, or the hot air out? Hot air shouldn't be more than 200degF, and probably closer to 150degF max.
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Uhhh .... well .... you asked ...
I want to come up with a design variation for a rocket mass heater. Something that might be easier for folks that have an existing fireplace, but the "mass" part might seem too intimidating. At the moment I'm calling this "a rocket radiator" and have a long, drawn out discussion about it here.
So this would all be for exhaust. The initial ducting might get up to 500 degrees, but the latter temps will probably reach a max of about 120 degrees.
There is a lot to figure out still, but I am starting to gather materials for an experiment.
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12/05/09, 04:25 PM
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Join Date: Jan 2005
Location: Florida
Posts: 4,481
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Quote:
Originally Posted by artificer
Duct tape should never be used on... ducts. Actually, its originally called Duck Tape.
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No, duct tape has always been duct tape. Duck tape is a brand name.
But you are correct about the foil tape. It's far better for ducts than regular duct tape.
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12/05/09, 05:44 PM
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Join Date: Feb 2007
Location: Wisconsin
Posts: 964
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Quote:
Originally Posted by tyusclan
No, duct tape has always been duct tape. Duck tape is a brand name.
But you are correct about the foil tape. It's far better for ducts than regular duct tape.
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I know, I know, its always been used for ducts. Its also always been leaking.
The original WWII military waterproof tape was nicknamed "duck tape." After WWII Johnson & Johnson changed the color from OD green to gray, and named it "Duct tape."
It works great, until it gets hot, drys out, and then starts leaking. Numerous groups have tested it, and said to not use it on duct work. Its even more important today, since more of the hvac ducting is flexible insulated ducts, as opposed to the traditional sheetmetal ducting.
Michael
http://www.consumerenergycenter.org/...ing/ducts.html
http://www.homeenergy.org/archive/he...98/980710.html
http://www.lbl.gov/Science-Articles/...tape-HVAC.html
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12/05/09, 06:02 PM
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Formerly 4animals.
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Join Date: Jul 2005
Location: south alabama(Hartford)
Posts: 1,023
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Quote:
Originally Posted by tyusclan
No, duct tape has always been duct tape. Duck tape is a brand name.
But you are correct about the foil tape. It's far better for ducts than regular duct tape.
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Wrong this was on the history channel. it was called duck tape because it was used by the military to seal off ammo boxes and water proof things they called it DUCK tape because it repelled water like a duck( like quack quack).
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12/05/09, 06:25 PM
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Join Date: May 2002
Location: missoula, montana
Posts: 1,407
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Oh wow! That tape sounds pretty fantastic!
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12/05/09, 07:08 PM
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Failure is not an option.
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Join Date: Jan 2007
Location: Wisconsin
Posts: 2,623
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I believe high heat silicone for engines goes to 600 degrees...
__________________
It's not good enough that we do our best; sometimes we have to do what's required. - Winston Churchill
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12/05/09, 10:53 PM
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Join Date: Jan 2005
Location: Wisconsin
Posts: 1,995
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Why do you you need tape to seal exhaust venting?
When I see tape on venting, it screams "Bubba"
A well designed and installed system, like "B" vent, or tri wall stainless, even black pipe shouldn't need tape at all on the exhaust vent.
Last edited by hunter63; 12/05/09 at 10:59 PM.
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12/05/09, 10:57 PM
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Join Date: Jan 2005
Location: Wisconsin
Posts: 1,995
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Quote:
Originally Posted by travis91
Wrong this was on the history channel. it was called duck tape because it was used by the military to seal off ammo boxes and water proof things they called it DUCK tape because it repelled water like a duck( like quack quack).
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Agreed, it was also in the back of Handy Magazine in the "what is it" section.
Works good on race cars though, to hold it together til the end of the race
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12/05/09, 11:43 PM
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Join Date: Jun 2002
Location: SE Washington
Posts: 1,407
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You can buy foil tape at most hardware or the big box hardware stores. It's used on furnaces and ducting. It's pretty sticky and I've never had any come off yet.
Bob
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12/07/09, 09:06 AM
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Defending the Highground
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Join Date: Mar 2008
Location: Central Wisconsin
Posts: 580
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We just relined our fireplace chimney with a stainless liner. When we wrapped the flue liner with insulation, we used aluminum flue tape to seal it on. The stuff is amazing. Worth every penny!
RVcook
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12/07/09, 05:10 PM
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Moderator
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Join Date: May 2002
Location: Ontario
Posts: 12,685
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Quote:
Why do you you need tape to seal exhaust venting?
When I see tape on venting, it screams "Bubba"
A well designed and installed system, like "B" vent, or tri wall stainless, even black pipe shouldn't need tape at all on the exhaust vent.
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We were taught you seal your vent pipes to increase draft by eliminating leakage. They don't make high heat rated foil tape for nothing!! 
__________________
Do not meddle in the affairs of Dragons, for you are crunchy and good with ketchup........
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