Bradford White PDX1-40S6FBN Installation And Operating Instruction Manual page 27

Venting continued-
THROUGH THE WALL VENTING: (HORIZONTAL VENTING WITH
STANDARD VENT TERMINALS).
Cut two 2 1/2 in. (6.4 cm) diameter holes in the wall at the point where the vent
connector is going to pass through the wall. Use the proper cement to secure
the 90° vent terminal provided with the water heater to the vent connector. The
distance between the edges of the 90° vent terminal and the exterior wall (see
Figure 10) must be 1 in. (2.5 cm). The exhaust and intake must not be less
than 16" (40.6 cm) apart (see figure 11a). Use the proper cement and
assembly procedures to secure the vent connector joints between the terminal
and the blower outlet. Provide support brackets for every 5 feet (1.5m) of
horizontal vent.
2" VENT INSTALLATION
3" VENT INSTALLATION
Figure 10
27