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The chimney cap should be pyramid shaped on the top with a perfectly flat surface immediately above the chimney outlet. The hood should be attached by four (4) iron supports. The four iron supports should be equal in height to the width of the chimney opening. Four plates, flaring down, can be added to help insure that the wind will pass straight over the chimney outlet. Chimney Relining A tile lined masonry chimney serving an oil fired boiler should comply with applicable building codes such as