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SlimFit
Series 2
®
DIRECT VENT — Sidewall
(Category IV)
3. Vent pipe penetration:
a. Cut a hole for the vent pipe.
b. For combustible construction, size the vent pipe hole at least 3/8"
larger than the vent pipe diameter, or larger if specified by the
vent manufacturer.
c. For noncombustible construction, size the opening per vent
manufacturer instructions.
d. Insert a corrosion-resistant metal thimble in the vent pipe hole as
shown in Figure 29.
e. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
4. Figure 37 — Provide and install corrosion-resistant metal stop plates
(item 3) as shown.
a. The hole size in the stop plates must be just larger than the vent
pipe diameter.
b. Obtain stop plates ONLY from the vent pipe manufacturer.
5. Insert the last lengths of vent and air pipe from the outside. The
shoulders of the vent and air pipe female ends must rest against the
outer stop plates as shown. The plates must prevent the vent or air
pipe from being pushed inward.
6. The vent and air pipes may run up as high as 4 feet with no enclo-
sure. The vent and air pipes must be secured with braces, and all
clearances and lengths must be maintained. Space braces no further
than 24 inches apart.
7. External venting greater than 4 feet requires an insulated enclosure
around the vent and air pipes. The vent and air terminations must exit
through the enclosure as shown in the illustration above, maintaining
all required clearances.
8. Attach the exterior piping and termination elbows.
9. Install a vent/air pipe manufacturer's bird screen in the open end of
the vent termination elbow and air termination elbow.
10. Seal exterior openings thoroughly with exterior caulk.
11. For multiple boiler terminations, see Figure 36.
Provide access for cleaning the boiler air inlet
1. The boiler air inlet must be accessible for period examination and
cleaning of the air inlet filter. This can be done by installing an 8-inch
capped tee as shown in Figure 35 or by installing the air piping in a
way that will allow disconnection of the air piping from the boiler air
connection.
2. Install a pipe size reducer on top of the tee if using 6-inch air piping.
DO NOT use a 6-inch tee.
3. Use only the air piping materials listed in Figure 22, page 25.
Figure 35
Direct venting — install tee on air inlet or provide means to
disassemble the air piping to allow access to the inlet air
filter
40
commercial condensing gas
(continued)
1. Vent/air pipe manufac-
turer's SlimFit Vent/Air
Adapter, 8-inch outlet.
2. Vent/air pipe manufactur-
er's tee, 8-inch — orient
the tee so the cover will
be on the same side as
the boiler heat exchanger
cleanout cover.
3. Air pipe connection,
8-inch — add vent/air pipe
manufacturer's reducer if
using 6-inch air piping.
4. Vent/air pipe manufac-
turer's cover, 8-inch.
5. Vent piping (a vent/air
pipe manufacturer's Slim-
Fit Vent/Air Adapter must
be installed at the boiler
vent connection).
Use only the vent/air piping
materials listed in Figure 22,
page 25.
— Boiler Manual
-
fired water boiler
Figure 36
Figure 37
1. Vent piping —
outside until the female end
shoulder rests against the
outside stop plate.
2. Air piping —
outside until the female end
shoulder rests against the
outside stop plate
3. Sidewall termination plates
(hole must be just larger than
the pipe diameter).
Multiple terminations — clearance from
vent of one to air intake of the next
(normal and snorkel layouts).
DIRECT VENT — sidewall termination
assembly.
insert from the
4. Vent termination elbow — use
outward-facing 90-degree
elbow as shown.
5. Air termination elbow — use
down-turned 90-degree elbow
insert from the
as shown.
6. Corrosion-resistant thimble, by
installer.
.
7. Bird screens, by installer.
8. Vent length.
9. Elbow.
Part number 550-100-561/0224
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