17 table 5, combined vent sizing tables – A.O. Smith HW 610 User Manual
Page 17
17
TABLE 5, COMBINED VENT SIZING TABLES
MODEL HW-300 BOILER
Input: 300,000 Btuh
Draft Hood Outlet 8"
Required Connector or Smoke Pipe Diameter
Connector
Rise in Feet
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Connector Diameter (in Inches)
1
10
10
10
10
10
10
10
10
10
2
10
10
10
10
10
10
10
10
10
3
10
10
10
10
10
10
10
10
10
4 or more
Number
if Units
Combined
Total Input
Btuh x 1000
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Manifold and Common Vent Diameter (in Inches)
2
600
14
12
12
12
10
10
10
10
10
3
900
16
14
14
14
12
12
12
12
12
4
1200
18
16
16
14
14
14
14
12
12
MODEL HW-399 BOILER
Input: 399,000 Btuh
Draft Hood Outlet 10"
Required Connector or Smoke Pipe Diameter
Connector
Rise in Feet
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Connector Diameter (in Inches)
1
12
12
12
12
12
12
12
12
12
2
12
12
12
10
10
10
10
10
10
3
12
10
10
10
10
10
10
10
10
4 or more
10
10
10
10
10
10
10
10
10
Number
if Units
Combined
Total Input
Btuh x 1000
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Manifold and Common Vent Diameter (in Inches)
2
798
14
14
14
12
12
12
12
12
12
3
1197
18
16
16
14
14
14
14
14
12
4
1596
20
20
18
16
16
16
14
14
14
MODEL HW-420 BOILER
Input: 420,000 Btuh
Draft Hood Outlet 10"
Required Connector or Smoke Pipe Diameter
Connector
Rise in Feet
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Connector Diameter (in Inches)
1
12
12
12
12
12
12
12
12
12
2
12
12
12
10
10
10
10
10
10
3
12
10
10
10
10
10
10
10
10
4 or more
10
10
10
10
10
10
10
10
10
Number
if Units
Combined
Total Input
Btuh x 1000
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Manifold and Common Vent Diameter (in Inches)
2
840
14
14
14
12
12
12
12
12
12
3
1260
18
16
16
14
14
14
14
14
12
4
1680
20
20
18
16
16
16
14
14
14
MODEL HW-520 BOILER
Input: 520,000 Btuh
Draft Hood Outlet 10"
Required Connector or Smoke Pipe Diameter
Connector
Rise in Feet
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Connector Diameter (in Inches)
1
14
14
14
12
12
12
12
12
12
2
12
12
12
12
12
12
12
12
12
3
12
12
12
12
10
10
10
10
10
4 or more
12
12
12
12
10
10
10
10
10
Number
if Units
Combined
Total Input
Btuh x 1000
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Manifold and Common Vent Diameter (in Inches)
2
1040
16
16
14
14
14
14
12
12
12
3
1560
20
18
18
16
16
14
14
14
14
4
2080
22
22
20
18
18
18
16
16
14
5
2600
26
24
22
20
20
18
18
18
18
6
3120
28
26
24
22
22
20
20
18
18
7
3640
30
28
26
24
24
22
22
20
20
8
4160
32
30
28
26
24
24
22
22
20
MODEL HW-610 BOILER
Input: 610,000 Btuh
Draft Hood Outlet 12"
Required Connector or Smoke Pipe Diameter
Connector
Rise in Feet
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Connector Diameter (in Inches)
1
16
14
14
14
14
14
14
14
14
2
14
14
14
14
14
12
12
12
12
3
14
14
12
12
12
12
12
12
12
4 or more
12
12
12
12
12
12
12
12
12
Number
if Units
Combined
Total Input
Btuh x 1000
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Manifold and Common Vent Diameter (in Inches)
2
1220
18
18
16
16
14
14
14
14
14
3
1830
22
20
20
18
18
16
16
16
14
4
2440
26
24
22
20
20
18
18
18
16
5
3050
28
26
26
24
22
22
20
20
18
6
3660
32
28
28
26
24
24
22
22
20
7
4270
34
32
30
28
26
24
24
22
22
8
4880
36
34
32
30
28
26
26
24
24
9
5490
38
36
34
30
30
28
28
26
24
10
6100
40
38
36
32
30
30
28
26
26
11
6710
42
38
38
34
32
30
28
28
26
12
7320
44
42
38
36
34
32
32
30
28
MODEL HW-670 BOILER
Input: 660,000 or 670,000 Btuh
Draft Hood Outlet 12"
Required Connector or Smoke Pipe Diameter
Connector
Rise in Feet
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Connector Diameter (in Inches)
1
16
14
14
14
14
14
14
14
14
2
14
14
14
14
14
12
12
12
12
3
14
14
12
12
12
12
12
12
12
4 or more
12
12
12
12
12
12
12
12
12
Number
if Units
Combined
Total Input
Btuh x 1000
Total Vent Height (Measured in Feet Above Draft Hood)
10
15
20
30
40
50
60
80
100
Manifold and Common Vent Diameter (in Inches)
2
1220
18
18
16
16
14
14
14
14
14
3
1830
22
20
20
18
18
16
16
16
14
4
2440
26
24
22
20
20
18
18
18
16
5
3050
28
26
26
24
22
22
20
20
18
6
3660
32
28
28
26
24
24
22
22
20
7
4270
34
32
30
28
26
24
24
22
22
8
4880
36
34
32
30
28
26
26
24
24
9
5490
38
36
34
30
30
28
28
26
24
10
6100
40
38
36
32
30
30
28
26
26
11
6710
42
38
38
34
32
30
28
28
26
12
7320
46
44
40
38
36
34
34
32
30
Known:
(5) model HW-610 boilers. (See illustration).
Connector rise - 2' (Note 1' is minimum). Total vent
height 30'.
Problem:
Determine diameter of connector, manifold and
common vent.
Procedure: Enter the top of the HW-610 table (total vent height)
at 30' and the side at 2' (connector rise). A 14"
connector diameter is indicated for each connector
rise.
To determine the manifold and common vent size, enter table on this
page (total vent height) at 30 and the side at 5 boilers. A manifold
diameter of 24" (610 mm) is indicated.