Vent Pipe Separation; Cutting Openings Through An Outside Wall And Collar Installation; Installation Showing Use Of Pvc, Abs Or Cpvc Pipe For Inlet And Outlet Vent Piping - A.O. Smith GPD-40 Instruction Manual

FIGURE 23B.
3. Minimum vent length for all models is 18 inches (46 cm).

VENT PIPE SEPARATION

The inlet and outlet vent pipes must be separated by a minimum
distance of 6 1/2 inches (16.5 cm) up to 24 inches (61 cm)
maximum.
FIGURE 24.
CUTTING OPENINGS THROUGH AN OUTSIDE WALL
AND COLLAR INSTALLATION
After reading the manual and determining the location for the
opening in the wall, cut one 3 1/2" (9 cm) diameter hole for the
inlet vent piping and one 3 1/2" (9 cm) diameter hole for the outlet
vent piping through an exterior wall.
Note: When determining the location of the openings in the
outside wall, allow for the 1/8" (3.2 mm) rise per five feet
(1.5 m) of length required in the horizontal run. See Figure 25.
The 3" PVC, ABS, or CPVC Schedule 40 vent pipe can be run
from the water heater through the wall or from the wall to the water
heater, whichever is most convenient. The vent pipe must extend a
minimum of 1 1/2" (4 cm) through the exterior wall. Extending the
vent cap as far as possible from the surface of the exterior wall
will help minimize discoloration of the wall. Note that the inside fl ue
mounting adaptors must be slipped over the vent piping before
locating the pipe through the wall. Before securing the inside and
outside collars to the wall, use a silicone sealer between pipe and
opening to ensure a water and air tight seal.
INSTALLATION SHOWING USE OF PVC, ABS OR
CPVC PIPE FOR INLET AND OUTLET VENT PIPING
Inlet piping through any type wall.
19
FIGURE 25.
FIGURE 26.