You can exhaust out most any direction, just avoid excessive number of bends in your ducting....
Concrete board will flake off some particles of concrete in beginning, I suggest you seal concrete board with something simple like a water base paint.... No it wont get so it will burn paint, if it gets that hot you have other problems...
Lining with aluminum would solve the dust and grit problem but not necessary...
You can if you want...
Dale
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Vendor-Artist-Studio-Teacher Registry
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San Francisco - A Few Toys Short of a Happy Meal
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