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exhaust port size?

updated thu 7 may 98

 

Tracey Dobbins on wed 6 may 98

------------------
Greetings:

I'm about to put my fiber kiln together, finally, 6 cubic feet worth, and =
wonder
if I'd be foolish trying to put a top exhaust port in it thats only 3 1/4=22=
I/D,
rather than the 4=22-5=22 I've had suggested as a standard size?
For those of you that may have a similar set-up, do you cover this port at =
any
any time for increased reduction?

Also, does anyone remember a recent thread mentioning whether it's the hard
bricks or soft bricks that dramatically increases insulation? Which ones are
rated to which temps? (Got deleted somehow...bummer.)

As always, many thanks in advance for all your kind replys....Tracey

tracey=5Fdobbins=40nols.edu