WardBurner@aol.com on sat 6 sep 97
Hey folks,
Following this thread and I noticed this part of a post;
<<<burner port. That way it will draw in secondary air and you will be
fine.>>>>
No burner that is designed for open port applications (open port meaning you
can see the flame or look into the port from the outside) should be put into
the port. Zero. Zip. Nada. None. The rule of thumb is to back off the burner
1/4" for every inch of flame tube diameter. So a two inch pipe on a burner
requires a 1/2" back off. These are industry standards that deal with clean
firings, no fiddle'n around making "tuned flues", ect. Potters tend to "fire
incorrectly" as far as industry is concerned, so consider the setbacks above
as a minimum. You can go as much as a 1/2 - 3/4 inch setback per inch of
flame tube diameter. If the perimeter of your port glows, you've gone too far
or your port is too small. I am not an advocate of small ports and flues,
especially for forced air. Venturi burners typically entrain only 30-50% of
their primary air through the mixing bell. You have to have adequate space
around the burner to entrain the necessary secondary air and to help cool the
burner head.
Happy firings to ya'll
Marc Ward
Ward Burner Systems
PO Box 333
Dandridge, TN 37725
USA
423.397.2914 voice
423.397.1253 fax
wardburner@aol.com
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