Part number
550-100-268/1220
7
CONDENSING
GAS
BOILER
—
V
ENT
A
DDENDUM
Direct Exhaust
(Category II Only) – Vertical
Figure 3
DIRECT EXHAUST vertical termination
Determine location for vertical termination
1. Locate the vent termination using the following guide-
lines:
2. The vent piping must terminate in a coupling as shown
in Figure 4, page 8.
3. Consider the surroundings when terminating the vent:
a. Position the vent termination where vapors will not
damage nearby shrubs, plants or air conditioning
equipment or be objectionable.
b. The fl ue products will form a noticeable plume as
they condense in cold air. Avoid areas where the
plume could obstruct window views.
c. Prevailing winds could cause freezing of condensate
and water/ice buildup where fl ue products impinge
on building surfaces or plants.
d. Avoid possibility of accidental contact of fl ue prod-
ucts with people or pets.
e. Do not locate the termination where wind eddies
could affect performance or cause recirculation,
such as inside building corners, near adjacent build-
ings or surfaces, window wells, stairwells, alcoves,
courtyards or other recessed areas.
f. Locate or guard vent to prevent condensate damage
to exterior fi nishes.
4. Maintain clearances as shown in the illustrations in this
manual section. Also maintain the following:
a. Vent must terminate:
• At least 12 inches above roof or snow line as
shown in Figure 4, page 8.
• At least 6 feet from adjacent walls.
• No closer than 5 feet below roof overhang.
• At lease 3 feet above any forced air intake within
10 feet.
• No closer than 48 inches below or horizontally
from any door or window or any other gravity
air inlet.
b. Do not terminate closer than 4 feet horizontally
from any electric meter, gas meter, regulator, relief
valve or other equipment.
5. Where the vent penetrates the roof, the annular space
around the penetration must be permanently sealed
using approved materials to prevent entry of combus-
tion products into the building.
6. Locate terminations so they are not likely to be damaged
by foreign objects, such as stones or balls, or subject to
buildup of leaves or sediment.
7. Do not connect any other appliance to the vent pipe.
Prepare roof penetration
1. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or
noncombustible construction, size the vent pipe hole
at least 0.5” larger than the vent pipe diameter – use a
7” hole for 6” PVC.
b. Insert a galvanized metal thimble in the vent pipe
hole.
2. Follow all local codes for isolation of vent pipe when
passing through fl oors, ceilings and roofs.
3. Provide fl ashing and sealing boots sized for the vent
pipe and air pipe.
DIRECT EXHAUST — Vertical termination —
installation sequence overview
Step 1
Install the boiler.
Step 2
Determine the proper location for wall penetration for each
termination.
• Prepare roof penetrations before installing vent piping.
• Finish by attaching external pipe and fi ttings as shown in the
termination instructions.
• Install terminations as described in this manual.
• Support vertical runs on the outside of the building with
brackets as shown in the termination instructions.
Step 3
Install vent piping from boiler to termination.
• Install a hanger support within 6 inches of any upturn in
the piping.
• Install pipe supports every 5 feet on both the horizontal and
vertical runs.
• Slope horizontal piping downward toward the boiler at least
1/4 inch per foot.
Step 4
Connect the vent piping at the boiler per manual instructions.
6” to 4”
bell reducer
EV-3505E-bw
VENT
VENT
Max.
5 feet
apar
t
(Support, typica
l)
Vertical support, typical
within 6 inches of any
upturn and Max. 5 feet
apart (by others if needed)
*
Double Acting
Barometric Damper
(by others
if needed)
*
Thermal
Spill Switch
(by others if needed)
*
Variable Speed
Vent Inducer
(by others if needed)
Backflow Preventer
(as needed) per Para.1
