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WARNING
Asphyxiation hazard. DO NOT use screws to secure
piping together. Failure to follow these instructions
could cause death or serious injury.
6.9 Multiple Boiler Venting - General
• Approved vent manufacturer - DuraVent - Concentric only.
• See Figures 6-35, 6-36 and 6-37. Termination must be
vertical through the roof. Sidewall horizontal terminal not
allowed.
• Ensure minimum downward slope of 2 in (50.00 mm) for
every 3 ft 4 in (1.00 m) of duct length toward boiler.
• Manufacturer recommends use of CO monitor, calibrate
regularly per CO monitor manufacturer instructions.
• Place pipes at least 1 in (30 mm) from heat sources.
• Keep area clean and free of debris.
• Use only water (H
O) as lubricant when inserting pipes
2
together. Do NOT use any type of grease or similar
substances.
• Do NOT use screws to secure pipes together.
• Before securing pipe with clamps, verify pipe is inserted
¹/₃₂
into gasket between
• Install steel strapping (A) of pipe (B) distance of 10 in
(250.0 mm) from boiler.
• Secure flue pipe to wall with supports 4 ft. (1 meter) from
each other. Secure supports along the joint of each pipe.
6.10 Multiple Boiler Venting - Mounting Procedure -
See Figures 6-29 thru 6-33
1.
Vent pipes correctly mounted. See Figure 6-29.
2.
Line horizontal common vent pipes with male end towards
condensate collector end cap.
3.
Fully insert male end of horizontal common vent pipe into
bell end of another horizontal common vent pipe. Mark
horizontal common vent pipe male end once fully inserted.
Pull horizontal common vent pipe back 1/32 in. to 19/32
in. from full insertion.
4.
Hang horizontal common vent pipe, do not fully tighten
clamps down.
5.
Connect end cap and condensate trap to horizontal
common vent pipe. See Figure 6-31.
6.
Connect 90° elbows to horizontal common vent pipe for
each boiler in cascade system
7.
Connect flue damper to 90° elbow for each boiler in
cascade system.
6 - COMBUSTION AIR AND VENT PIPING
₃₂
in and ¹⁹/
in (8.0-15 mm).
FIGURE 6-29 Correctly Mounted Piping
L > 10 in
(250 mm)
FIGURE 6-30 Correctly Mounted Piping
FIGURE 6-31 Correctly Mounted Piping
35
P/N 240011662, Rev. D [06/30/2017]
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