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Document 1427-BW
Common Venting for Brute
pg 4 of 7
1
Item
Number
Venting Component
1
Appliance Adapter for Coupler Style Flue Collar
2
Connector Ring
3
Non-Return Valve (NRV)
4
Centric Increaser, 2” to 3”
Table 2: Non-Return Valve Kit Components
Item
Number
Venting Component
1
Appliance Adapter for Coupler Style Flue Collar
2
Connector Ring
3
Non-Return Valve (NRV)
4
Vent Length
5
87
o
Elbow
6
Branch Tee
7
Horizontal Drain Tee
8
Universal Ball Valve Siphon
9
Tee Cap
Table 3: Venting Components
Vent Diameter
4”
6”
8”
10”
12”
87
o
Elbow
5
5
8
10
10
45
o
Elbow
2
2
3
5
5
Table X: Equivalent Vent Length of Elbows
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
5" Trunk
6" Trunk
2
160,000
100
100
3
240,000
100
100
4
320,000
100
100
5
400,000
100
100
6
480,000
89
100
7
560,000
66
100
8
640,000
51
100
Table 4: Max Equiv Vent Length for BNTH080
Vents can be installed in a vertical or horizontal orientation. The maximum allowable equivalent lengths for the
common vent system (air intake and exhaust each) are listed by boiler model, in tables 4-11 below. Keep in mind
that this is the equivalent vent length, and that elbows create additional pressure drop which must be accounted
for. Use an equivalent length of 8 feet for 87º or 90º elbows and 3 feet for 45º elbows.
Note that the branch tees directly above the boilers, as well as the individual boiler vent lengths feeding into the
branch tees do not need to be included when sizing a common vent system. However, e󰀨orts must be made to
minimize the lengths of these portions of the vent system. They should not exceed 5 feet of vent length above
each boiler, and 3 feet of vent length between each boiler unless absolutely necessary.
1. To size a common vent system, rst determine the total equivalent length of venting needed to reach the
desired termination point.
2. Next, nd the relevant maximum length table for the model that is being installed, and using the previously
determined equivalent vent length, as well as the number of units in the installation, select a suitable trunk
diameter for the vent.
2.C Sizing a Common Vent System
2
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
5" Trunk
6" Trunk
2
210,000
100
100
3
315,000
100
100
4
420,000
100
100
5
525,000
74
100
6
630,000
52
100
7
735,000
39
100
8
840,000
30
100
Table 5: Max Equiv Vent Length for BNTH105
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent Vent Length
(ft)
5" Trunk 6" Trunk
8"
Trunk
2
300,000
100
100
100
3
450,000
96
100
100
4
600,000
55
100
100
5
750,000
36
100
100
6
900,000
25
95
100
7
1,050,000
N/A
70
100
8
1,200,000
N/A
54
100
Table 6: Max Equiv Vent Length for BNTH150 & BNTV150
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
6" Trunk
8" Trunk
2
398,000
100
100
3
597,000
100
100
4
796,000
100
100
5
995,000
74
100
6
1,194,000
52
100
7
1,393,000
38
100
8
1,592,000
29
84
Table 7: Max Equiv Vent Length for BNTV199
2
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
5" Trunk
6" Trunk
2
210,000
100
100
3
315,000
100
100
4
420,000
100
100
5
525,000
74
100
6
630,000
52
100
7
735,000
39
100
8
840,000
30
100
Table 5: Max Equiv Vent Length for BNTH105
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent Vent Length
(ft)
5" Trunk 6" Trunk
8"
Trunk
2
300,000
100
100
100
3
450,000
96
100
100
4
600,000
55
100
100
5
750,000
36
100
100
6
900,000
25
95
100
7
1,050,000
N/A
70
100
8
1,200,000
N/A
54
100
Table 6: Max Equiv Vent Length for BNTH150 & BNTV150
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
6" Trunk
8" Trunk
2
398,000
100
100
3
597,000
100
100
4
796,000
100
100
5
995,000
74
100
6
1,194,000
52
100
7
1,393,000
38
100
8
1,592,000
29
84
Table 7: Max Equiv Vent Length for BNTV199
2
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
5" Trunk
6" Trunk
2
210,000
100
100
3
315,000
100
100
4
420,000
100
100
5
525,000
74
100
6
630,000
52
100
7
735,000
39
100
8
840,000
30
100
Table 5: Max Equiv Vent Length for BNTH105
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent Vent Length
(ft)
5" Trunk 6" Trunk
8"
Trunk
2
300,000
100
100
100
3
450,000
96
100
100
4
600,000
55
100
100
5
750,000
36
100
100
6
900,000
25
95
100
7
1,050,000
N/A
70
100
8
1,200,000
N/A
54
100
Table 6: Max Equiv Vent Length for BNTH150 & BNTV150
Number
of Units
Total
Input
(Btu/h)
Max. Equivalent
Vent Length (ft)
6" Trunk
8" Trunk
2
398,000
100
100
3
597,000
100
100
4
796,000
100
100
5
995,000
74
100
6
1,194,000
52
100
7
1,393,000
38
100
8
1,592,000
29
84
Table 7: Max Equiv Vent Length for BNTV199