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Gas-Fired Boiler Installation
Page 8
If the air inlet and/or exhaust vent terminal are through
the sidewall, clearances from other exhaust/inlet,
windows, doors, building openings, snow line, etc
must be as shown in the figure above.
There must be either 5' vertical separation or 10'
horizontal separation between the flue gas outlet and
the combustion air inlet.
The bottom of the flue gas outlet must be located at
least 12 inches above finish grade or snow line, but
must be at least 7 feet above finish grade when located
adjacent to a public walkway. It must also have a
minimum clearance of 4 feet horizontally from, and in
no case above or below, (unless a 4 foot horizontal
distance is maintained,) electric meters, gas meters,
regulators and relief equipment.
3.4.2 Rooftop Installations
4' min.
above
snow line
10' min.
4' min.
Flue Gas
Outlet
Combustion
Air Inlet
Combustion
Air Inlet
Vent
4' min.
above
snow line
10' min.
4' min.
Flue Gas
Outlet
Clearances which must be maintained when both inlet
and exhaust are through the roof are shown in the
figures above.
3.4.3 Minimum Clearance for Boiler
Connections
There are special considerations needed when
installing the air inlet and exhaust duct systems
because of the orientation of these connections on the
boilers.
3.4.3.1 Series 700, 1000, 1200
Air Inlet
Round
Damper
26" Min.
*
90 Elbow
o
* Dimension shown above is based on 12" round
ductwork.
A minimum clearance of 26 inches is required on the
left side of the boiler to permit the connection of the
air inlet duct to the boiler.