RE: toroid

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com> 

No adverse effect, but it's clear you haven't tried it.  If the duct
were a straight cylinder, it may make it smoother, but as a torus
curved, the foil will not lie straight, and it will be a mess.  Using
relatively narrow, individual strips of aluminum tape (HVAC aisle of
Home Depot) is the best bet, although I know of no way to make the
surface free of corrugation ridges.  Covering the duct with paper strips
soaked in water & Elmer's glue prior to aluminum tape is the best method
I've tried, but still not perfect.

Gary Lau
MA, USA

Original poster: Jimbo07031982-at-aol-dot-com

Would using multiple layer's of tin foil warp around aluminum ducting in

order to get it ultra smooth have an averse effect on it?