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(Refer to figure 14) A. ASSEMBLING THE FLASHING SET Follow the instructions packaged with the P23 Flashing set part C-P23-MEDFL-C or C-P23-LGFL-C. (Refer to Figure 15) FIGURE 14 FIGURE 15 INSTALLATION12 INSTALLATION12 B. WHEN VENT PIPE EXTENDS TO CHIMNEY TOP (Refer to Figures 16 and 17) 1. You will need a pipe length equal to the chimney height (from hearth) plus 6 inches. If outside combustion air is to be used, you will need a pipe length (see “COMBUSTION AIR SUPPLY”) equal to the chimney heig