Allied Air Enterprises 95G1DF Exhaust Piping Figure, Minimum Vent Pipe Lengths, MIN. Vent Length

1.In areas where piping penetrates joist or interior walls, hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger.

2.When furnace is installed in a residence where unit is shut down for an extended period of time, such as a vacation home, make provisions for draining condensate collection trap and lines.

Exhaust Piping (Figure 20)

Route piping to outside of structure. Continue with installation following instructions given in piping termination section.

CAUTION

Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack.

CAUTION

The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

Vent Piping Guidelines

This gas furnace can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace.

NOTE: In non-Direct Vent installations, combustion air is taken from indoors and flue gases are discharged outdoors. In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors.

Intake and exhaust pipe sizing - Size pipe according to Tables 6 and 7. Table 6 lists the minimum vent pipe lengths permitted. Table 7 lists the maximum pipe lengths permitted.

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination.

In some applications which permit the use of several different sizes of vent pipe, a combination vent pipe may be used. Contact Allied Air Technical Service for assistance in sizing vent pipe in these applications.

MINIMUM VENT PIPE LENGTHS

A95DF, 95G1DF, A93DF, & 92G1DF	MIN. VENT LENGTH*
MODELS

	15 ft. or
045, 070, 090, 110	5 ft plus 2 elbows or
	10 ft plus 1 elbow

*Any approved termination may be added to the minimum length listed.

TABLE 6

Use the following steps to correctly size vent pipe diameter.

1	045, 070,
	090, 110

Furnace capacity?

Standard or

2 Which termination?Concentric? See Table 5

3	Which needs	Intake or
	most elbows?
		exhaust

4How many?

5	Desired pipe size?	2", 2 1/2"
		or 3"

6What is the altitude?

Use Table 7 to find

7max intake or exhaust pipe length.

FIGURE 19

IMPORTANT

Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations.

506725-01 Issue 1109 Page 15 of 48