Allied Air Enterprises 95G1UH, A95UH, A93UH, 92G1UH EXHAUST PIPE TERMINATION SIZE REDUCTION Table

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

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

Intake and exhaust pipes may be routed either horizontally through and outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is preferred. Figures 30 through 40 show typical terminations.

1.Exhaust and intake exits must be in same pressure zone. Do not exit one through the roof and one on the side. Also, do not exit the intake on one side and the exhaust on another side of the house or structure.

2.Intake and exhaust pipes should be placed as close together as possible at termination end (refer to illustrations). Maximum separation is 3” (76 mm) on roof terminations and 6” (152 mm) on sidewall terminations.

3.On roof terminations, the intake piping should terminate straight down using two 90° elbows (See Figure 30).

4.Exhaust piping must terminate straight out or up as shown. A reducer may be required on the exhaust piping at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See Table 6.

EXHAUST PIPE TERMINATION SIZE REDUCTION

Table 6

NOTE: Care must be taken to avoid recirculation of exhaust back into intake pipe.

DIRECT VENT ROOF TERMINATION KIT

(15F75 OR 44J41)

Figure 30

FIELD SUPPLIED WALL TERMINATION

See venting Table 5 for maximum venting lengths with this arrangement.

*Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm).

NOTE: One wall support must be 6” (152 mm) from top of each pipe (intake and exhaust).

Figure 31

506501-01 Issue 1031 Page 25 of 48