Combustion Air And Vent Piping; General - Dunkirk DCBF-100 Manual

WARNING
!
Fire, explosion, and asphyxiation hazard.
Improper installation could result in death or
serious injury. Read these instructions and
understand all requirements before beginning
installation.
WARNING
!
ABS/PVC venting shall not to be used this
product.
Use of DWV plumbing pipes to vent this boiler
shall be prohibited.
Use of cellular core PVC (ASTM F891), cellular
core CPVC, or Radel® (polyphenolsulfone) in
venting systems shall be prohibited.
Covering non-metallic vent pipe and fittings with
thermal insulation shall be prohibited.
Failure to follow these instructions could result in
death or serious injury.
Follow venting manufacturer's
Note
equivalent lengths for specialty fittings.

5.1 General

• Installations shall comply with Authority having
jurisdiction and in absence of such with:
» U.S. ANSI Z223.1 /NFPA 54 in the United States
• This boiler requires a dedicated direct vent system.
• Vent connections serving appliances vented by
natural draft shall not be connected into any portion
of mechanical draft systems operating under positive
pressure.
• Use only manufacturer approved venting materials or
venting materials primer and glue approved to: ULC
S636 in Canada, or UL 1738 in the U.S.
• Materials used in the U.S. shall comply with Authority
having jurisdiction and in absence of such with:
ANSI/ASTM D1785, ANSI/ASTM F441, ANSI/ASTM
F493.
• Vent system must have unrestricted movement
through walls, ceilings and roof penetrations.
• Check for proper joint construction when joining pipe
to fittings.
• If vent is penetrating ceilings and floors, openings
must have means of fire stopping in joist areas and
proper fire-stop spacer assemblies installed.
• Standard roof flashing methods must be used to
install roof flashing.
• Frame wall and roof openings to provide support for
attachment of termination assemblies.

5 - COMBUSTION AIR AND VENT PIPING

• Support piping in accordance with pipe
manufacturer's instruction and authority having
jurisdiction. In absence of manufacturer's instruction
use pipe hooks, pipe straps, brackets, or hangers of
adequate and strength located at intervals of 3 ft (1 m)
or less. Allow for expansion/ contraction of pipe.
• Venting shall be supported adjacent to each joint
using steel strapping or equivalent. See Figure 5-1.
• Support horizontal sections of vent pipe to prevent
sags capable of accumulating condensate.
• Assemble vent materials in accordance with venting
manufacturer's instructions.
• Slope exhaust pipe minimum of 1/4" per foot, or
vent manufacturer's recommendation, whichever is
greater; back toward the boiler.
• Any "in line" elbows in flue system must be taken
into consideration. First elbow on the top of the
boiler is included in equivalent length calculations.
• Use U.V. stabilized polypropylene when it will be
exposed to sunlight, wind, or prone to freeze ups.
• Check for proper joint construction when joining pipe
to fittings.
• Manufacturer requires use of an approved
mechanical fastener, which may vary per vent pipe
manufacturer, at every push-fit gasket connection
when using a single wall polypropylene vent system.
• Refer to specific vent manufacturer's manual for
additional support.
Figure 5-1 - Venting Support
17
240013375 REV A, [07/01/2021]