Follow the following procedure to vent through the roof:
1.Cut the necessary holes through the roof and ceiling
2.Install the exhaust vent and air intake plastic pipes as shown in Figure 17. Make sure that the installation meets the local codes and/or The National Fuel Gas Code ANSI Z223.1 (Latest Edition) or CGA/CAN B149 Installation Code.
Figure 17. Typical Vertical Power Vent System Installation
Through The Wall Venting With Low Ground Clearance:
When venting cannot exit through the wall at a height greater than or equal to 12” (30.5 cm) (and above expected snow level) from the ground, then the installation must be modified as shown below (see Figure 18). Refer to Tables 3 or 4 for maximum venting lengths using 3” (7.6 cm) or 4” (10.2 cm) diameter plastic pipe.
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