A.O. Smith GPDT Venting System Example Installation For ALL Models, DIA. Vents Number of 90 DEG

FIGURE 11. STANDARD MODELS.

FIGURE 14.

*If making an immediate horizontal run of vent off the blower, two 3" PVC or ABS Schedule 40 street elbows are required.

1.The water heater requires its own (separate) venting system.

2.3" PVC, ABS or CPVC Schedule 40 piping and fittings are acceptable materials for the vent system.

3.It cannot be connected to existing vent piping or chimney.

4.When venting through an outside wall, the vents must terminate horizontally to the outdoors.

VENTING SYSTEM EXAMPLE INSTALLATION

FOR ALL MODELS

The vent piping cannot under any circumstances be run downhill.

FIGURE 12.

The vent piping can be installed as follows:

1. Horizontal runs require a minimum 1/8" (3.2mm) rise per 5' (1.52 m).

FIGURE 13.

FIGURE 15.

2.The total vertical and horizontal vent runs cannot exceed the maximum length with the number of 90° elbows as specified in the table below. If more elbows are required, the venting distance must be reduced 5 feet (1.52 m) for every 90° elbows:

3" DIA. VENTS	NUMBER OF 90° DEG.
MAX. LENGTH (FT.)	ELBOWS *
45 (13.72 m)	1
40 (12.2 m)	2
35 (10.7 m)	3

*NOTE: Two 45° elbows are equivalent to one 90° elbow. One 90° elbow equals 5 feet (1.52 m) of equivalent vent length.

FIGURE 16.

3.Minimum vent length for all models is 18 inches (45.7 cm).

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