On Tue, 13 Jul 2004 07:06:04 -0400, "George" george@least wrote:

After the zinc is gone, perhaps.

One more reason for dropping the shavings before stuffing dust through the
impeller.

Question, isn't duct tape good enough, that folks use sheet metal screws?

FWIW, I highly recommend metal tape versus duct tape - at least from the
standpoints of being a much better seal and the tape not delaminating from
the adhesive layer after some time. The metal tape is more expensive. But
a regular HVAC duct with metal tape at the seams and the joints, if you
want, is darn "airtight" in this context, IMO. The metal tape won't handle
bumps and such as well, so in some places you could use duct tape over the
metal tape. -- Igor