The 5-Run Masonry Heater developed by the MHA over the last 5 years is an ingenious design which leverages the modularity of firebrick with the following dimensions: 9″ x 4 1/2″ x 2 1/4″. You can see in this picture that the majority of the bricks used are either halves, three-quarters, or fulls. This significantly reduces the amount of cutting and also allows for a great deal of the bricks to be pre-cut which is of great value to the custom masonry heater builder. Whitaker Greer is the only company I know of making this size firebrick – hopefully other brick manufacturers will follow suit.

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