M3
CONDENSING WATER BOILER
18
34-1115 12/15
7.4 Vertical or Horizontal Remote Air Duct Termination
• Air inlet must be located no less than 3 feet (0.91m) below the exhaust terminal if they are within 10 feet (3.05 m)
of each other, unless the flue outlet terminates with a straight discharge. If the flue outlet terminates with a
straight discharge, the air inlet can be located no less than 18 inches (0.46m) below the exhaust terminal.
• If terminating through the roof, the air inlet must terminate at least 12 inches (0.3 m) above roof level and at least
12 inches (0.3 m) above snow levels.
• If terminating through a sidewall, the air inlet must terminate at least 12 inches (0.3 m) above grade and/or at
least 12 inches (0.3 m) above possible snow levels.
Vertical Remote Air Horizontal Remote Air
* When flue outlet is terminated with a straight discharge, separation of terminations must be a minimum of 18”.
7.5 Combining Remote Air Ducting
Each boiler MUST have separate intake piping, unless the air inlet piping, exhaust duct and other system
considerations have been fully evaluated and a combined duct system designed by one of the duct design firms
identified at www.Riverside Hydronics.com/vent-design.html. Before operation of a combined remote air ducting
system, all of the duct design firm’s system installation and operation requirements must be in place, their
instructions followed and the system must be properly maintained.
WARNING: Do not combine remote air ducting of multiple appliances into a single remote air duct unless the
combined remote air ducting system has been evaluated and designed by a specified duct design firm and
the combined remote air duct system is installed, operated and maintained following instructions from that
firm. Combining remote air ducting without following these requirements can result in failure of the boiler
and venting system and/or exposure to carbon monoxide and can result in property damage, personal injury
or death.
Notes:
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