3 venter (flue) outlet diameter, 4 vent system sealing, 1 type of vent pipe required for vent run – Reznor UDBP Option - Installation - Power Venting User Manual
Page 3: 2 vent pipe diameter and vent length
Form I-UD-V-PV, P/N 195675R12, Page 3
2.0 Venting Requirements and Instructions - Residential Installation
A Category III vent as defined by the National Fuel Gas Code Z223.1 or CAN/CSA B149.1 and B149.2 is required for a
residential installation of a Model UDAP. Some venting requirements will vary, however, depending on whether the vent
is horizontal or vertical.
Read and follow all of the requirements and instructions in Paragraphs 2.1 through 2.7.
Residential Installation
Only Model UDAP 30, 45, 60, 75, 100, 125
2.1 Type of Vent
Pipe Required
for Vent Run
Type of Pipe for Standard Horizontal Vent (Category III)
•
Vent pipe approved to UL Std 1738 for Category III appliance.
Type of Pipe for Standard Vertical Vent (Category III)
•
Vent pipe approved to UL Std 1738 for Category III appliance.
TABLE 1 - Vent Pipe Diameter and Maximum Vent Length for a Heater
with either a Horizontal or Vertical Vent
UDAP
Size
Vent Pipe
Diameter
Maximum
Vent Length
Equivalent Straight
Length for 90° Elbow
Equivalent Straight
Length for 45° Elbow
Field-supplied taper type
reducer 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)
4
102
10
3.0
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)
4
102
10
3.0
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)
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
2.2 Vent Pipe
Diameter and
Vent Length
Vent pipe diameters and maximum vent lengths are shown in
TABLE 1. Minimum vent
length is 3 feet (1M). Add all straight sections and equivalent lengths for elbows. The
total must not exceed the Maximum Vent Length listed. Use only one diameter of vent
pipe on an installation.
2.3 Venter (Flue)
Outlet Diameter
Depending on the size of vent pipe (either 3 or 4 inch) as determined in Paragraph 2.2,
attach a 4” appliance adapter from Category III pipe manufacturer directly to the collar,
then use a reducer if using 3” pipe.
TABLE 2 -
Venter Outlet
Diameter
UDAP
30
45
60
75
100
125
Outlet
Diameter
inches mm inches mm inches mm inches mm inches mm inches mm
4
102
4
102
4
102
4
102
4
102
4
102
2.4 Vent System
Sealing
Follow the Category III pipe manufacturer’s instructions for joining pipe sections. When
attaching Category III pipe to the venter outlet or the vent cap, make secure, sealed
joints following a procedure that best suits the style of Category III pipe being used.