i recently wheeled and dealed and came into the possession of several hundred (maybe more) fire bricks (from 3 round incinerators) that are slightly triangular in shape to make a round roughly 3' diameter circle, many are whole many are half's. all i wanted was enough to make a Mass Rocket heater, But never look a gift horse in the mouth If anyone is passing thought North Central Arkansas and is in need of Fire Bricks PM me. i'll try to get pics later
are you going to make a rocket mass heater with a 3' diameter burn chamber? that sounds pretty amazing. and really hot. 3' diameter heat exchanger made of brick wouldn't be as hot, but still pretty neat to see. please post about it when you start building. with pictures.