On Feb 1, 11:12*pm, "John Grabowski" wrote:
"sid" wrote in message

...

This is a continuation of the following thread:
http://groups.google.com/group/alt.h...hread/thread/2...

I visited HD and found a transition to 2-1/4" x 12". (27sq")
Here are some photos:http://picasaweb.google.com/basement009/Duct#
I need to flatten out the ductwork and have it hug the microlam to
recover about 3" and make room for a header for a standard door. View
full size to see the labels.

*Looks like a nice easy run. *Post some after pictures so we can see the
change.

There were some suggestions on finding a tin shop and having them
fabricate a piece that would transition from 6" round to rectangle
bend under the microlam and back up.

Why can't I just buy some tin from the hardware store and fabricate my
own from tin and pop-rivets ?
It would save a lot of time and money designing and explaining it to
someone else.

Does it have to be Tin or can it be galvanized steel ? and do I have
to worry about aluminum rivets corroding with the steel ?

Thanks