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6 - COMBUSTION AIR AND VENT PIPING
Fire, explosion, and asphyxiation hazard. Improper installation could result in death or serious injury. Read
these instructions and understand all requirements before beginning installation.
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 equivalent lengths for specialty fittings.
6.1 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
» CSA B149.1 in Canada.
• 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 firestop 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.
• 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 6-1.
• 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.
WARNING
!
WARNING
!
NOTICE
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240012485 REV C [06/30/2019]
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