1 type of vent pipe required for vent run, 2 vent pipe diameter and length – Reznor UDBP Option - Installation - Power Venting User Manual
Page 6
Form I-UD-V-PV, Page 6
3.0 Venting
Requirements
and
Instructions
- Commercial/
Industrial
Installation
3.1 Type of Vent Pipe Required for Vent Run
A commercial/industrial installation may have either a horizontal or a vertical vent run
using one of the types of vent pipe listed.
Horizontal
Vent Run
Vent pipe approved to UL Std 1738 for a Category III
appliance, OR
Appropriately sealed 26-gauge or heavier galvanized steel
or equivalent single-wall pipe
Vertical
Vent Run
Vent pipe approved to UL Std 1738 for a Category III
appliance, OR
Appropriately sealed 26-gauge or heavier galvanized steel
or equivalent single-wall pipe, OR
If at least 75% of the equivalent length of the vent run is
vertical - Double-wall (Type B) vent pipe
3.2 Vent Pipe
Diameter and
Length
TABLE 4 - Vent Pipe Diameter and Length for Horizontal and Vertical Vents
Vent pipe diameters and maximum vent lengths in
TABLE 4 apply to both Horizontal
and
Vertical vents. Add all straight sections and equivalent lengths for elbows. The
total combined length must not exceed the
Maximum Vent Length. Minimum vent
length is 3 feet (1M). Use only one diameter of vent pipe on an installation.
UDAP
and
UDBP
Vent Pipe
Diameter
Maximum
Vent Length
Equivalent Straight
Length for 90° Elbow
Equivalent Straight
Length for 45° Elbow
Field-supplied taper type
connection required at the
venter outlet
inches mm feet
M
feet
M
feet
M
30
3
76
20
6.1
3
0.9
1.5
0.5
4” to 3” (102mm to 76mm) reducer
4
102
10
3
2
0.6
1
0.3
None
45
3
76
20
6.1
3
0.9
1.5
0.5
4” to 3” (102mm to 76mm) reducer
4
102
10
3
2
0.6
1
0.3
None
60
3
76
30
9.1
4
1.2
2
0.6
4” to 3” (102mm to 76mm) reducer
4
102
15
4.6
2
0.6
1
0.3
None
75
4
102
30
9.1
4
1.2
2
0.6
None
100
4
102
40
12.2
5
1.5
2.5
0.8
None
125
4
102
40
12.2
5
1.5
2.5
0.8
None
150
5
127
35
10.7
5
1.5
2.5
0.8
None
175
5
127
35
10.7
5
1.5
2.5
0.8
None
200
5
127
50
15.2
5
1.5
2.5
0.8
None
225
5
127
50
15.2
5
1.5
2.5
0.8
None
250
5
127
50
15.2
5
1.5
2.5
0.8
None
300
6
152
50
15.2
5
1.5
2.5
0.8
None
350
6
152
50
15.2
7
2.1
3.5
1.1
None
7
178
50
15.2
4.5
1.4
2.25
0.7
6” to 7” (152 to 178mm) enlarger
400
6
152
50
15.2
8
2.4
4
1.2
None
7
178
50
15.2
5
1.5
2.5
0.8
6” to 7” (152 to 178mm) enlarger
Commercial/Industrial Installation
Models UDAP and UDBP - ALL Sizes