Warming up

I'm in the process of adding a basement bathroom adjacent to my laundry room.
I'd like to insert a "T" into the 5" heat duct running along the floor joist above my new bathroom, thus providing heat where there was none.
When all is said and done, I'll have a ceiling diffuser shooting heat down into my new bathroom.
Question: how best to cut the existing heat duct to insert the "T"?
Would a reciprocating saw with metal blade do the trick? And can I slice it in place, or am I going to have to pull the duct down to work on it? (almost not worth it if I have to do that, in my opinion)
Never tried this before...any suggestions appreciated.
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daler wrote:

Assuming your current duct system is well designed, you may be creating a problem where one currently doesn't exist.

If you insist....use duct snips.
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