When we used to make plexiglas-softening ovens, we'd just detach a
motor from a squirrel-cage blower, and re-assemble it with a sheet of
asbestos in between. For higher temperatures, it should be pretty
easy to use a short shaft extension or coupling made of insulating
material. Many motors have small internal fans, and there is usually
room to add one when an alternate air flow has been cut off.
Bob Stuart
On 13-Nov-10, at 4:03 PM, Mark Ludlow wrote:
Hi Ken,
Of all of the expendable vacuum cleaner motors, I found the Kirby
to be the
longest-lived. They are cast aluminum and the shunt-wound motor
allows them
to really rip! In theory, I think that this application would
require an
X-Proof rating (Class 2 Group F, maybe) since there's generally no
way of
ensuring that enough O2 to allow combustion could absolutely be
avoided. But
then things really get messy!
Mark
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