Weil-McLain SlimFit Manual page 46

SlimFit
™
commercial condensing gas
DIRECT VENT — Vertical
Install vent and air terminations
1. Air pipe penetration
a. Cut a hole for the air pipe, sized per the vent/air
pipe manufacturer's instructions.
2. 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.
e. Follow all local codes for isolation of vent pipe when
passing through floors, ceilings and roofs.
3. Vertical terminations, both vent and air
a. Provide flashing and sealing boots sized for the
vent pipe.
b. Use a coupling or open-end pipe termination, fol-
lowing vent manufacturer's guidelines for vertical
terminations.
c. Install a vent/air pipe manufacturer's bird screen in
the open ends of the terminations.
d. Maintain the required dimensions of the finished
termination piping as shown in Figure 43.
4. Vertical vent termination with sidewall air termination
a. See Figure 45, page 47.
b. Figure 46, page 47 — Provide and install corrosion-
resistant metal stop plates (item 3) as shown.
c. The hole size in the stop plates must be just larger
than the vent pipe diameter.
d. Obtain stop plates ONLY from the vent pipe
manufacturer.
e. Insert the last length of air pipe from the outside.
The shoulder of the air pipe female end must rest
against the outer stop plate as shown. The plate
must prevent the air pipe from being pushed inward.
f. Insert the termination elbow into the air pipe end.
g. Install a vent manufacturer's bird screen in the open
end of the vent termination elbow.
h. Seal exterior openings thoroughly with exterior
caulk.
Provide access for cleaning the boiler air
inlet
1. The boiler air inlet must be accessible for periodic
examination and cleaning of the air inlet filter. This can
be done by installing an 8-inch capped tee as shown in
Figure 47 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 vent/air pipe manufacturer's 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 28,
page 31.
46
-
fired water boiler
(continued)
Figure 43
Vertical vent and air terminations
Figure 44
Termination location — multiple boilers — vent and air
piping vertical
— Boiler Manual
Part number 550-100-116/0713