18
type B gas Vent
multiple gas fired tank-type heaters
When venting multiple tank type heaters using Type b vent
pipe, follow the installation diagram (figure 13) and tables
below which give sizing and data based upon nFPA 54/AnSI
Z223. 2006.
taBle 6. teChniCal data Venting
model BCl380t1996noX, BCl3100t1996noX
input: 199,000 Btu/hr
total Vent height (feet)
Vent connector size: 6 inches
6
8
10
15
20
30
50
100
input Btu/hr
rise
Vent Connector diameter (inches)
199,000
1 ft.
7
7
7
6
6
6
6
6
199,000
2 ft.
7
7
6
6
6
6
6
6
199,000
3 ft.
6
6
6
6
6
6
6
6
number of heaters
Combined input
in thousands of
Btu/hr
manifold and Common Vent diameter (inches)
2
398,000
8
8
8
7
7
7
6
6
3
597,000
10
9
9
9
8
8
7
7
4
796,000
12
12
10
10
9
9
8
8
