You would be correct to not use duct tape on the joints.

Find metal tape. Here is an example:
http://store.yahoo.com/poseysupply/2x60yarfoilt.html

A good brand name is Nashua.

(top posted for your convenience)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing . . . .
DanG (remove the sevens)




"Robert11" wrote in message
...
Hello:

Regarding all the round sheet metal duct work exiting our
typical gas fired, hot air heating
furnace:

What's the best way to seal these duct joints, at least where
one can actually see them ?

Duct tape doesn't really sound like the best way to go.

Would appreciate any suggestions as to brands, etc.

I guess I should also ask:

Is it necessary to do so for the hot air ducts ?

How about for the duct leading to roof flue exhaust (no
fireplace in house) ?

Thanks,
Bob