Quote:
Originally Posted by RaymondMillbrae
If you look at the pictures, the torch tip is approximately 1.5" inches away from the edge of the hood. Which is OK, as the flame itself is entirely under the hood.
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Raymond,
Have you seen the August 2007 issue of The Annealer magazine? There is an article with images showing the thermal plume and how it's affected (actually deflected) by the placement of a bead in the flame. The recommended position of the front of your torch is over the center of the torch body, otherwise your hood is NOT catching all of the thermal plume (as in your case).
And if you are going to recommend to someone to reduce the ducting from 10" to 8", do you have the formula to show exactly what percentage are you lowering the efficiency of the fan? Leslie/tiggybubba's fan is 790 CFM which means that her hood shouldn't be larger than 24" x 38" (without baffles/enclosures). . . that's WITHOUT reduction from 10" to 8" ducting and/or bends in her ducting.