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Flex vs. Aluminum ducts farseer 01-18-2007
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Posted by Howard on January 19, 2007, 9:53 am
I have flex as a result of a major remodel done a few years ago. The
idiot contractor connected them using ordinary duct tape and did not
provide adequate support for each run. On at least 3 occasions the
flex seperated from junction boxes and I had to fix them. (the crawl
space was being heated better then the house).

If I had known then what I no now I wouldn't have allowed this crap to
ever be installed. If it's installed 100% correctly then I guess
it's a pretty good idea but that's a big "if". I'd say Flex is
totally unforgiving to poor installation procedures.
The other problem if that flex is round. Sometimes rectangular will
be less of an obstruction in areas where form factor is a
consideration.

I'd recommend 22 gauge galv. ducts in a heartbeat.





wrote:

>I am having an HVAC system installed in my basement. I would like to
>know what is the consensus/general opinion regarding the use of Flex
>vs. Metal ducts? Which should i use?
>
>I have had 3 companyies tell me i should use metal as much as possible
>and use flex where necessary. Another two tell me everyone is using
>flex these days and there is no disadvantage.
>
>Please advise.
>
>thank you


Posted by jamesgangnc on January 19, 2007, 12:42 pm
Properly sized and installed flex is just as good as metal duct and is
far cheaper to install.

farseer wrote:
> I am having an HVAC system installed in my basement. I would like to
> know what is the consensus/general opinion regarding the use of Flex
> vs. Metal ducts? Which should i use?
>
> I have had 3 companyies tell me i should use metal as much as possible
> and use flex where necessary. Another two tell me everyone is using
> flex these days and there is no disadvantage.
>
> Please advise.
>
> thank you


Posted by Bubba on January 19, 2007, 4:00 pm
On 19 Jan 2007 09:42:23 -0800, "jamesgangnc"

>Properly sized and installed flex is just as good as metal duct and is
>far cheaper to install.
>
>farseer wrote:
>> I am having an HVAC system installed in my basement. I would like to
>> know what is the consensus/general opinion regarding the use of Flex
>> vs. Metal ducts? Which should i use?
>>
>> I have had 3 companyies tell me i should use metal as much as possible
>> and use flex where necessary. Another two tell me everyone is using
>> flex these days and there is no disadvantage.
>>
>> Please advise.
>>
>> thank you

So you seem to know a whole lot about friction loss in flex compared
to metal ductwork james?
And of course we all know that flex in a Phoenix attic will last
forever where as the metal duct work will melt in a heart beat. duhh
Bubba

Posted by AKS on January 19, 2007, 3:45 pm
Well the way I see it Flex vs. Metal there is couple differences
cans: yes it does restrict some of air flow.
pros: is less loses of air temp. like metal it does not conduct
air temperature on outer wall,
there for not likely getting the condensation on outer wall
and it is cheaper installation.
Securing the flex duct to distribution duct
clamps are made for that.
Three pros. One cons. you pick?
from Dido

>I am having an HVAC system installed in my basement. I would like to
> know what is the consensus/general opinion regarding the use of Flex
> vs. Metal ducts? Which should i use?
>
> I have had 3 companyies tell me i should use metal as much as possible
> and use flex where necessary. Another two tell me everyone is using
> flex these days and there is no disadvantage.
>
> Please advise.
>
> thank you
>



Posted by farseer on January 19, 2007, 5:00 pm
Thanks for all the replies. I am leaning towards "Metal and flex where
necessary". I've see cases where these flex get crushed, easily
damaged and the connections fall apart due to they taping they
use...don't want to be ripping up walls to fix these things in a few
years.

farseer wrote:
> I am having an HVAC system installed in my basement. I would like to
> know what is the consensus/general opinion regarding the use of Flex
> vs. Metal ducts? Which should i use?
>
> I have had 3 companyies tell me i should use metal as much as possible
> and use flex where necessary. Another two tell me everyone is using
> flex these days and there is no disadvantage.
>
> Please advise.
>
> thank you


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