Beau Davidson wrote:-If I build a single brick bell directly over the heat riser, and adhere to 57 square feet for my 6 inch tube as per the above material, is there a standard rule on how far the unit needs to be from the nearest wall?
-Can I vent cool exhaust using regular ducting, or do I need some heavier duty stuff?
-Do I need to seal the interior of the bell with cob or other to prevent gas leaks on startup?
Glenn Herbert wrote:"So it need to be (if I remember correctly) 2" from the nearest combustible wall."
Peter, I think you meant 2 feet, not 2 inches, correct?