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INSTALLATION - VENTING
For Vertical Concentric Vent Kits
(Refer to Figure 9.2):
• The bottom of the combustion air intake pipe must
terminate above the snow line, or at least 12" above
the roof, whichever distance is greater.
• The bottom of the vent cap must terminate at least 6"
above the top of the combustion air intake cap.
For Horizontal Concentric Vent Kits
(Refer to Figure 9.3):
• The combustion air intake pipe must terminate at least
1" from the wall to prevent water from running down the
wall and into the pipe.
• The back of the vent cap must terminate at least
14" from the combustion air intake pipe.
D7. Cut the concentric side vent and combustion air pipes to
the proper length as determined in the previous step. See
Table 10.1 for combustion air and vent pipe sizes. The
pipes must be single wall galvanized or stainless steel
material, except for the last section of vent pipe, which
must be one continuous length of double wall B-vent
extended through the concentric vent box and combustion
air inlet pipe on the concentric side of the box.
NOTE - No clearance to combustible material is required
for the building penetration, which should be sized according
to the external combustion air Inlet pipe diameter.
D8. Allow the concentric side vent pipe to pass through the
concentric vent adapter box, as shown in Figure 10.1.
Attach the double wall vent pipe to the single wall vent
pipe that goes to the unit. Be sure to seal the joint and the
open area around the double wall vent. Seal all joints and
seams using sealant suitable for temperatures up to 400°F.
D9 Slide the combustion air pipe over the vent pipe and
attach to the air inlet of the concentric adapter box, as
shown in Figure 10.1, using at least 3 corrosion-resistant
sheet metal screws. Seal the joint and seam using sealant
suitable for temperatures up to 400°F.
D10. Place this assembly (the adapter box, vent pipe and
combustion air pipe) through the wall or roof and verify
that the distance requirements as defined in Step D7 are
met. Securely attach the assembly to the building.
D11. From outside the building, caulk the gap between the
combustion air intake pipe and the building penetration.
D12. Attach the combustion air intake and vent pipe
terminations as follows:
Figure 10.1 - Adapter Box with Combustion Air Intake Pipe
Attached
Outlet Vent
Pipe Extended
Through Box
A
10
Combustion Air
Pipe Attached
4.57"
B
Model Sizes
A
B
150-200
13.33"
18.84"
250-400
17.00"
15.27"
6-561.12
For Vertical Concentric Vent Kits
(Refer to Figure 9.2):
• Slide the combustion air cap down over the vent pipe
and fasten it to the combustion air pipe with at least
3 corrosion-resistant sheet metal screws.
• Attach the vent cap to the vent pipe using at least
3 corrosion-resistant sheet metal screws. Refer to
instruction A11 for connecting terminal to double wall
pipe.
• Caulk the gap between the combustion air cap and the
vent pipe with silicone sealant, or other appropriate
sealants suitable for metal to metal contact and for
temperatures up to 400° F.
For Horizontal Concentric Vent Kits
(Refer to Figure 9.3):
• Attach the combustion air intake guard using corrosion-
resistant screws at the end of the combustion air intake
pipe to prevent animals and debris from entering.
• Attach the vent cap to the vent pipe using at least
3 corrosion-resistant sheet metal screws.
D13. Install vent pipe and combustion air pipe between unit
heater and concentric vent adapter box as outlined in
"Section A – General Instructions – All Units".
D14. Once venting is complete, proceed to the section titled
"Installation - Gas Connections".
Table 10.1 - Concentric Vent Pipe Sizes
Single Wall Pipe
Combustion Air (To
Model Size
Unit)
150-200
4"
250-400
6"
B-Vent must have 1/4" air gap (OD is 1/2" larger than ID).
Figure 10.2 - Adapter Box Exploded Assembly
Type B Vent Pipe
Combustion Air
Vent
(External)
(Pass-Through)
6"
4"
8"
6"
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