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SSCBL-RPBL-IOM (10-22) 149159-C
Specific Venting Requirements: Venter Outlet and Combustion Air Inlet Connections
⚠ DANGER ⚠
All separated-combustion units MUST BE equipped with both combustion air and exhaust piping
to the outdoors.
Each furnace section has both an inlet air and a venter outlet connection . Both are 6 inches (152 mm) in diameter
for all unit sizes .
NOTE: If using 7-inch pipe, use a tapered 6- to 7-inch enlarger to attach the vent pipe and a 7- to
6-inch reducer to attach the combustion air pipe.
Specific Venting Requirements: Joints and Sealing
Seal pipe joints as follows:
• To seal joints in Category III vent pipe:
Follow the pipe manufacturer’s instructions for joining and sealing
Category III vent pipe sections .
• To seal joints in single-wall vent or combustion air pipe:
Secure slip-fit pipe connections using sheet metal
screws or rivets . Seal all joints with aluminum tape or silicone sealant .
• To seal the joint in the terminal section of double-wall vent pipe
(allowed ONLY ABOVE the concentric
pipes on a VERTICAL vent)
:
Follow the pipe manufacturer’s instructions for joining and sealing double-wall
vent pipe sections .
• To seal the joint between the terminal section of double-wall vent pipe and the vent cap:
Follow the illustrated
• To seal the joint between the terminal section of double-wall vent pipe and a single-wall or Category III
vent pipe:
follow the illustrated step-by-step instructions in
. Make this connection no more than 6 inches
(152 mm) from the concentric adapter box .
NOTE: Pipes and vent caps may not look exactly as shown in the illustrations. Instructions apply
to both horizontal and vertical vent kits.
Table 16. Pipe Diameter and Maximum Pipe Length from Each Furnace Section
to Concentric Adapter Box
Diameter/Length
SSCBL Unit Size
500, 600
400, 700, 800, 1050, 1200
Diameters (Inches (mm))
Vent pipe
6 (152)
7 (178)
Inlet air pipe
6 (152)
7 (178)
Lengths (Feet (Meters))
Minimum
5 (1 .5)
Maximum, 6-inch pipe
50 (15)
30 (9)
Maximum, 7-inch pipe
70 (21)
Equivalent straight length for 45-degree elbow
4 (1 .2)
Equivalent straight length for 90-degree elbow
8 (2 .4)
INSTALLATION—CONTINUED
Venting/Combustion Air Connections (Model SSCBL)—Continued
Specific Venting Requirements: Piping—Continued