It's more restrictive then metal,however properly sized (Man. D from ACCA)and supported,the end result is the same for comfort.
It's easier to to installed in an air thight manner,and quieter at the grilles.
What is your opinion of insulated flex duct for heat runs ?
It's more restrictive then metal,however properly sized (Man. D from ACCA)and supported,the end result is the same for comfort.
It's easier to to installed in an air thight manner,and quieter at the grilles.
garbage............................sorry Dash...............again garbage.
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If you are installing in a non condictions space then it is required.. example : attic... where you install depends on what you use. You need the residential ductwork book.
It is not required in attics,
I use metal and wrap it or sleeve it.
Flex is the material of choice for hacks,
Not that all flex jobs are hacked in.
But few hacks will take the time to use metal.
If you try to fail, and succeed.
Which have you done ?
How about some H&C F144?
Is that duct is from Hart and Cooley? It looks pretty good. Are there substantial differences in insulated flex duct? Do some maintain their shape and air flow better?
Yeah. Here's the product info.
http://www.hartandcooley.com/flex/products/f144.htm
It's got the regular "trash bag" jacket, but the inner is corrugated aluminum. You can grab one end and hold it out straight. Makes nice bends too.. no kinks. And you don't need a strap every foot.. we use a ton of it.
However, it does cost twice as much as the regular flex.
Flexible duct is fine and is used by most everyone (even those who claim to hate it) because it saves time.
Since time is money it is a more realistic choice than a completely hardpiped system.
i went through about 18-20 boxes of 8" insulated flex yesterday. that doesn't mean it's right. 5' max length around here. i prolly put in more flex per year than the guys that do nothing but flex systems.
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I always tell the engineers that our system will comply with IMC 603.5.1.1
You'll have a good laugh when you get done looking that up.
Originally posted by tinner73
i went through about 18-20 boxes of 8" insulated flex yesterday. that doesn't mean it's right. 5' max length around here. i prolly put in more flex per year than the guys that do nothing but flex systems.
I don't want to argue semantics here, but I'm not sure what "right" has to do with utilizing insulated flex duct as part of a nice installation.
It is efficient, both in operation and labor savings and is convenient with no major performance drawbacks, if installed properly.
There are obviously more premium duct types to use, but there is little "wrong" with flexible duct that would keep me from wanting to continue using it.
it is not efficient
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How so?
If a duct system is sized properly, there is absolutely no change in operating efficiency.
ef·fi·cient Audio pronunciation of "efficient" ( P ) Pronunciation Key (-fshnt)
1. Acting or producing effectively with a minimum of waste, expense, or unnecessary effort.
smmoth round metal duct would be efficient.
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Uh huh. Well that definition really explains it.
Gee thanks.
A system with properly sized and installed flexible ductwork will have the exact same airflow and operating cost as it would with a properly sized and installed metal duct system.
The flexible duct system will cost much less.
The metal duct system will last longer.
Originally posted by mark beiser
A system with properly sized and installed flexible ductwork will have the exact same airflow and operating cost as it would with a properly sized and installed metal duct system.
The flexible duct system will cost much less.
The metal duct system will last longer.
Thank you Mark. My sentiments exactly.
yes you guys are right flex is definitely the best for airflow.
what was i thinking.
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