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I need to air condition a very small closet of my house.  And when I say small, I mean 2x4x8.  The air ducts currently run in my crawl space under my house.  What I'm thinking of doing is splicing into the duct that runs to my daughter's room (which is always freezing cold, so I don't think I would be stealing too much of her air), and then run duct to this closet's floor where I would have installed a register. 

I basically need step by step DIY instructions on how to pull this off, since I've never done anything with ductwork before, other than running a piece of flex from my clothes dryer's exhaust.  I need to know the materials I need to purchase, and how to go about cutting into hers and splitting the line.  I'm assuming I need some type of Y connector for that?

Thanks in advance!

Its super easy! First do some measuring. Find the size of the register, size of the duct piping, etc.

Most likely you want to buy the double wall flex piping, unless you have something else.

You're going to need a Y adapter to steal her air while still allowing her some. You cut the duct material, install the Y, tape it.

You buy new duct and run it from the Y to the closet register. Make sure to seal all the areas that you cut with the special HVAC tape.

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