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Determine total vertical height of the fireplace installation. This dimension is the distance from the surface the fireplace sets on to the point where smoke exits from the termination. 2. Determine the number of chimney components required, except chimney sections. This would include firestop spacers, stabilizers, roof flashing, etc. 3. The effective heights of the components are: The Fireplace = 43 ..." FTF8-12 = 10 ..." FTF8-18 = 16 ..." FTF8-36 = 34 ..." FTF8-48 = 46 ..." FTF8-CTD Terminatio