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Part number 550-142-054/0411
GV90+ gas-fired water boiler — Boiler Manual
40
DIRECT VENT — Sidewall with separate pipes (continued)
For multiple boiler applications using the manifolded
combustion air option, the vent can be terminated in
an elbow as in Figure 47, page 39, or in a coupling or
sidewall termination plate. The vents must be located
following the restrictions in Figure 41, page 35 and
Figure 38, page 31.
Prepare wall penetrations
1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe hole as close as
desired to the air pipe outside diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or non-
combustible construction, size the vent pipe hole at least 0.4”
larger than the vent pipe diameter:
• 4” hole for 3” PVC
b. Insert a galvanized metal thimble in the vent pipe hole as
shown in Figure 49.
3. Use a sidewall termination plate as a template for correct location
of hole centers. Sidewall termination plates are included with the
Weil-McLain sidewall vent/air plate kit, shipped with each boiler.
4. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
5. Seal exterior openings thoroughly with exterior caulk.
Termination and fittings
1. Prepare the vent termination elbow and the air termination elbow
by inserting bird screens. (See Figure 47, page 39.) Bird screens
must be purchased separately. See the parts list at the end of this
manual for part numbers.
2. When completed, the air termination coupling must be oriented
at least 12 inches below the vent termination and at least 12 inches
above grade or snow line as shown in Figure 47, page 39.
3. You can orient the vent termination elbow either directly out-
ward or 90 degrees away from the air inlet elbow as shown in
Figure 47, page 39.
4. Maintain the required dimensions of the finished termination
piping as shown in Figure 47, page 39.
5. For multiple boiler terminations, see Figure 48, page 40.
6. Do not extend exposed vent pipe outside of building more than
shown in this document. Condensate could freeze and block vent
pipe.
If extending the vent and air pipes out from the wall,
install a coupling on each pipe. Mount the piping with
the coupling flush with the outer plate.
Figure 48
Multiple separate pipes sidewall terminations
Figure 49 Sidewall termination assembly — using
separate pipes
1 Vent piping
2 Air piping
3 Sidewall termination plates, supplied with
boiler in W-M vent/air plate kit
4 Galvanized thimbles, by installer
5 Bird screen, by installer
6 Air inlet elbow
7 Elbow
8 Nipple
9 Elbow (vent termination)