Venting System Calculation/Sizing Chart - Buderus Logano plus GB312 Applications Manual

  _

5.5 Venting system calculation/sizing chart

Note:
Calculation example
vent pipe:
What size vent (exhaust) pipe is needed?
What size combustion air pipe is needed?
5.5.1
Operating Conditions:
GB312 Venting System Table
Models Input (MBH)
GB312-90 328
GB312-120 440
GB312-160 588
GB312-200 733
GB312-240 881
GB312-280 1029
GB312 Venting System Table
Models Input (MBH)
GB312-90 328
GB312-120 440
GB312-160 588
GB312-200 733
GB312-240 881
GB312-280 1029
Note: Breeching pressure measured at outlet of
boiler vent connection.
Vent (Exhaust) Outlet Vertical
Vent Venting Total Equivalent
Connection Diameter Length of Vent (max)
at Boiler (inches)
6" 6" 100
6" 6" 100
6" 6" 100
8" 8" 100
8" 8" 100
8" 8" 100
Combustion Air (inlet) Vertical
Combustion Combustion Total Equivalent
Air Inlet Air Pipe Length of Combustion
Connection Diameter Air Pipe (max)
at Boiler (inches)
4" 5" 100
4" 6" 100
4" 6" 100
4" 8" 100
4" 8" 100
4" 8" 100
combustion air pipe:
Venting Parameters:
Vent Diameter for (minus
one) size diameter and
TEL in feet
5" = 100ft
5" = 80ft
5" = 50ft
7" = 100ft
7" = 100ft
7" = 100ft
Combustion Air Pipe
Diameter (minus one
inch) maximum TEL
in feet
4" = 55ft
5" = 95ft
5" = 50ft
7" = 100ft
7" = 100ft
7" = 100ft
GB312 Applications Manual
7DEOH 
Vent Diameter for (minus
two) size diameter and
TEL in feet
4" = 55ft
4" = 30ft
4" = NA
6" = 70ft
6" = 55ft
6" = 35ft
Combustion Air Pipe
Diameter (minus two
inch) maximum TEL in
feet
3" = NA
4" = 30ft
4" = NA
6" = 70ft
6" = 55ft
6" = 35ft