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Old 08-26-2011, 12:53 PM   #1
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What sort of duct is this?


My AC duct looks like this.



They are old and I don't know what is the material. An HVAC professional who inspected them advised for them to be replaced.

Anyone have any idea what this material is and should I go ahead and replace them with a newer materials?

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Old 08-26-2011, 01:02 PM   #2
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What sort of duct is this?


Are you talking about the fiberglass wrapping, or what is under the fiberglass. What do they look like, when you go look at the main trunk in your attic? You do need more insulation up there, because it looks like only a inch, which is not going to do anything for helping to keep the home warm in the Winter, or cool in the Summer. There should be at least 8 inches min. up there. I would go around 12 inches.

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Old 08-26-2011, 01:24 PM   #3
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What sort of duct is this?


Could be asbestoes, so be careful, avoid shredding it. If you replace, consider adding like 3 feet of extra insulation afterwards, you hardly have any. Having the ducts under the insulation will make the system much more efficient too.
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Old 08-26-2011, 01:32 PM   #4
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What sort of duct is this?


Thanks for the responses, and insulation is my next project to work on.
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Old 08-26-2011, 02:29 PM   #5
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What sort of duct is this?


It looks like it may be what is known as "snaplock" pipe that has been wrapped with fiberglass. It's in good shape and should do a good job of supplying air. Are the returns in the floor?

It may be "spiral" pipe, but I doubt it since it is residential, unless the guy who owned the house at the time it was installed was a tinner.

As far as putting 3' of insulation in your attic, probably not necessary since you live in S.California, but it wouldn't hurt to add 12".
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Old 08-26-2011, 02:52 PM   #6
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What sort of duct is this?


Quote:
Originally Posted by fabrk8r View Post
It looks like it may be what is known as "snaplock" pipe that has been wrapped with fiberglass. It's in good shape and should do a good job of supplying air. Are the returns in the floor?
[SNIP]
Returns are in the wall, the top just under the roof line, the vent which puts the air in the rooms, if that is what you mean by returns.
The large grill, Intake is on the bottom, near the living room.
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Old 08-26-2011, 02:58 PM   #7
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What sort of duct is this?


The pipes in your attic are supplies (supply air).

The large grill is the "return air grill". It returns the air to the furnace/air handler.

The only reason I asked is because I just wanted to make sure there was a return because I didn't see any R/A duct in the attic.
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Old 08-26-2011, 02:59 PM   #8
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What sort of duct is this?


Those pipes are supply, your return is that grill you said that is near the living room.

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