Hi - I am having trouble sourcing fire bricks in New Zealand and the best I have come up with are from Placemakers but they are classed as a High Duty fire brick. It mentions in the FB plan these bricks should be avoided, but has anyone had any experience using these bricks - good or bad. The brick manufactures recommend its use in WFO's but I do not want to go to the trouble and expense of building an oven and find it not good to use. The plan mentions High duty bricks get too hot and burn breads etc, but could this be controlled by the size of fire and timing? Any thoughts would be appreciated. Regards Dave.