Buderus Logano G125 BE US/CA Installation And Service Instructions Manual page 29

7.2.1 All air drawn from inside the building
The G125 BE boiler has been approved for operation
drawing all combustion air from the room, provided the
installation meets the requirements of NFPA 31, and the
boiler is NOT vented horizontally.
7.2.2 All air drawn from outdoors
The boiler has been approved for operation drawing all
combustion air from the outside, provided the combus-
tion air intake system meets the following requirements.
The combustion air shall be directly delivered to the rear
of the boiler via 4" ducting.
Make an opening in the outside wall for wall termina-
tion.
Use 4" rigid galvanized pipe or 4" flexible metal pipe.
The maximum length of the fresh air piping must nev-
er exceed 100 ft. Reduce by 10 ft. for every 90° el-
bow, 5 ft. for every 45° elbow.
Install a fresh air intake hood with 1/2" screen to
avoid debris and objects from entering the pipe. In-
stall from the outside and secure.
Secure reducer to rear of boiler with 2 screws.
Connect fresh air ducting to reducer.
NOTICE
Use only 4" diameter air intake piping or
flexible metal hose. Outside components,
and not be susceptible to blockage from
debris, leaves or falling snow or ice.
Maximum fresh air intake piping must not
exceed 100 ft.
Logano G125 BE - Specifications subject to change without notice.
1
2
Fig. 20 Combustion air supply system
1 Wall termination
2 Fresh air intake piping
3 Reducer with sensing port
Boiler Installation 7
3
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