Installation Manual

Demand Duo™ H-Series Installation and Operation Manual 22
Concentric
Vent
Concentric Pipe Installation Instructions
Direct Vent (Concentric Pipe)
1
Concentric Vent Maximum Equivalent Length
Vent Sizes 2 in. X 4 in. 3 in. X 5 in.
Vent Lengths
65  (20 m) 150  (46 m)
• 45° elbow is equivalent to 3  (1 m)
• 90° elbow is equivalent to 6  (2 m)
Concentric Pipe Example Vent Applications
Horizontal Wall
Terminations
2 in. x 4 in.
3 in. x 5 in.
Vertical Roof
Terminations
2 in. x 4 in. and
3 in. x 5 in.
Concentric Pipe Maximum Vent Length
1. Remove and discard screw from concentric
flue connection.
2. Remove exhaust adapter ring (discard
for concentric venting configurations).
3. Install the concentric vent. Ensure it is
properly seated.
4. Secure the vent pipe to the concentric flue
connection with the supplied screw.
IMPORTANT
Install the venting termination according to
the diagrams and instructions in this manual.
Slope the venting 1/4 in. per foot toward the
appliance according to the vent
manufacturer’s installation instructions.
Dispose of condensate per local codes.
Figure 18
Figure 19
Figure 20
Figure 21