Airease 95G2UHV Installation Instructions Manual - page 27
506878-01
Page 27 of 62
Issue 1139
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
41W92 or 41W93 (Canada)
Figure 30
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.
NOTE:
Flue gas may be slightly acidic and may adversely
affect some building materials. If any vent termination is
used and the flue gasses may impinge on the building
material, a corrosion resistant shield (minimum 24 inches
square) should be used to protect the wall surface. If the
optional tee is used, the protective shield is recommended.
The shield should be constructed using wood, plastic, sheet
metal or other suitable material. all seams, joints, cracks,
etc. in the affected area should be sealed using an
appropriate sealant. See Figure 31.
Intake and exhaust pipes may be routed either horizontally
through an outside wall or vertically through the roof. In
attic or closet installations, vertical termination through the
roof is preferred. Figures 29 through 34 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 29).
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 7.
NOTE:
Care must be taken to avoid recirculation of exhaust
back into intake pipe.
DIRECT VENT ROOF TERMINATION KIT
(15F75 OR 44J41)
Figure 29
5. On field supplied terminations for sidewall exit, exhaust
piping may extend a maximum of 12 inches (305 mm)
for 2” PVC and 20 inches (508 mm) for 3” (76 mm) PVC
beyond the outside wall. Intake piping should be as
short as possible. See Figures 31 and 33.
6. On field supplied terminations, a minimum distance
between the end of the exhaust pipe and the end of the
intake pipe without a termination elbow is 8” and a
minimum distance of 6” with a termination elbow. See
Figure 31.
7. If intake and exhaust piping must be run up a side wall
to position above snow accumulation or other
obstructions, piping must be supported every 24” (610
mm) as shown in Figures 31. When exhaust and intake
piping must be run up an with pipe sized per Table 6.
The intake piping may be equipped with a 90° elbow
turndown. Using turndown will add 5 feet (1.5 m) to the
equivalent length of the pipe.
8. A multiple furnace installation may use a group of up to
four terminations assembled together horizontally, as
shown in Figure 33.
EXHAUST PIPE TERMINATION SIZE REDUCTION
Table 7
*
units with the flush mount termination must use the 1-1/2” accelerator
supplied with the kit