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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.
3.4.2Rooftop Installations 10' min.
Combustion |
| Flue Gas |
Air Inlet | 4' min. | Outlet |
4' min. above snow line
Clearances which must be maintained when both inlet and exhaust are through the roof are shown in the figures above.
3.4.3Minimum 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
90o Elbow
26" Min.*
| 10' min. |
| Vent |
Combustion | 4' min. |
Air Inlet | |
| 4' min. |
| above |
| snow line |
Flue Gas Outlet
*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.
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