The proper name for Duct Tape is Duct Insulators Tape. It's original
purpose was to hold the canvas in place over the insulation while the
Duct Insulators sewed the canvas up thus making the installation more
durable. That is why it is a cloth tape that is extremely sticky. It
is meant to conform to the canvas used to cover the old style
insulation used on ducts back in the day. It was never intended for
use directly on ducts. It was certainly never meant for use on gas
appliance vent tubing.
--
Tom Horne

On Aug 18, 6:21*am, wrote:
On Wed, 18 Aug 2010 07:09:52 -0230, "don &/or Lucille"

wrote:
I'd use the real aluminum tape not the mylar type stuff. 3M makes good one
expensive but you get what you pay for in this case, have used both at work
and now wouldn't use anything but the real McCoy

It's not as expensive as replacing his home after the duct tape
ignites and burns his house down. *
Duct tape is made for ducts (warm forced air), not HOT exhaust pipes.