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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.
!
WARNING
Cascade venting of condensing boilers shall be
vented with Duravent
®
material. Failure to follow these instructions could
result in death or serious injury.
6.9 Multiple Boiler Venting - General
• For common exhaust system DuraVent
approved vent manufacturer - DuraVent
valve is mandatory. See Figure 6-20.
• See Figures 6-26, 6-27 and 6-28. 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 per
the vent manufacturer's receommendations.
• Install steel strapping (A) of pipe (B) distance of 10 in
(250.0 mm) from boiler.
• Secure flue pipe to wall with supports 3 ft. (0.92 meters)
from each other. Secure supports along the joint of each
pipe.
6.10 Multiple Boiler Venting - Mounting Procedure -
See Figures 6-20 thru 6-22
1.
Vent pipes correctly mounted. See Figure 6-20.
2.
Line horizontal common vent pipes with male end towards
condensate collector end cap.
3.
Follow vent manufacturer's instructions when assembling
vent pipe to allow for expansion and contraction of vent
pipe during use.
4.
Hang horizontal common vent pipe, do not fully tighten
clamps down.
6 - COMBUSTION AIR AND VENT PIPING
polypropylene venting
is the only
®
. Use of check
®
FIGURE 6-20 Correctly Mounted Piping
L > 10 in
(250 mm)
FIGURE 6-21 Correctly Mounted Piping
FIGURE 6-22 Correctly Mounted Piping
32
USE OF CHECK
VALVE IS
MANDATORY
P/N 240011656, Rev. E [07/30/2018]
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