Running heatting/coooling ducts


Hi,
Suppose i am unable to get one duct run from the heating unit to where the vent will be and i am forced to use two ducts instead. What is the best way to connect these ducts? is using tape sufficient or are there specialized connections for these types of situations?
Also, currently, the duct that i see used are the black plastic ones, very thin it seems. Is insulation needed on these ducts?
Now i am not necessarily asking this so that i can do it myself, i am asking to see if it was done correctly by someone else.
thanks
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On the outside of the box for the flexible duct is usually a drawing of how they are to be spliced together. It says to use a sheet metal collar and clamps. That said I have inserted one section into the other (overlap) about 6" and used the aluminized tape to seal the joint and then to seal the insulation cover, again overlapped. Its been five years with no problems and no leakage on at least five connections. Since the duct comes in 50 foot lengths sometimes a splice can't be avoided, sometimes its spliced just to use up the remaining length.

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thanks much. I don't know what they did here...but in my basement, most of the ducts have a silver outer insulation, and within that is the pink insulation and within that is the black plastic wrapping the flex coil. However, for one particular duct, about 10 ft or so from the unit, it appears they stripped all of that out and left just the black plastic for about 5 feet then joined this to a duct leading up into the the first floor. It appears they did this so the duct could fit within the space between beams in the basement cieling. Is it ok to have just the black plastic uninsulated? How difficult would it be to replace this particular duct and run just one long duct?

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Use a wye connector.
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Looks like a wye connector allows splitting one duct into two. What i would like to do is simply join two ducts to create one long duct. seems there are some "industrial strength" type of duct tape i must use for such a job...
On Dec 9, 2:27 am, Al Moran wrote:

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