Reznor UBXC - Venter (Flue) Outlet Diameter; Category III Venting

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UBXC-UDXC-IOM (01-24) 1042980-0
Table 12. Venter (Flue) Outlet Diameter
Unit Size (MBTUh)
30, 45, 60, 75, 100, 125 150, 175, 200, 225, 250 300, 350, 400
Inches (mm)
4 (102)*
5 (127) 6 (152)
*Unit size 100 requires a 5-inch (127-mm) vent when vented as Category I.
Venter (Flue) Outlet Diameter
• Depending on the size of vent pipe, either attach the vent pipe directly to the collar or to a taper-type connector.
• For Category III vent pipe, attach a 4-inch appliance adapter (available from the Category III pipe manufacturer)
directly to the collar and then then use a reducer if using 3-inch pipe.
Category III Venting
Refer to Table 13 for required Category III pipe sizes. Refer to Table 14 for a list of Category III vent manufacturers.
Table 13. Category III Vent (Horizontal or Vertical) Pipe Diameters and Lengths
Unit Size
(MBTUh)
Vent Pipe
Diameter
(Inches (mm))
Maximum Vent
Length
Equivalent Straight Length*
Venter Outlet Connection**90-Degree Elbow 45-Degree Elbow
Feet (Meters)
30
3 (76) 20 (6.1) 3 (0.9) 1.5 (0.5) 4- to 3-inch (102- to 76-mm) reducer
4 (102) 10 (3) 2 (0.6) 1 (0.3) —
45
3 (76) 20 (6.1) 3 (0.9) 1.5 (0.5) 4- to 3-inch (102- to 76-mm) reducer
4 (102) 10 (3) 2 (0.6) 1 (0.3) —
60
3 (76) 30 (9.1) 4 (1.2) 2 (0.6) 4- to 3-inch (102- to 76-mm) reducer
4 (102) 15 (4.6) 2 (0.6) 1 (0.3)
—
75 4 (102) 30 (9.1) 4 (1.2) 2 (0.6)
100 4 (102) 40 (12.2) 5 (1.5) 2.5 (0.8)
125 4 (102) 40 (12.2) 5 (1.5) 2.5 (0.8)
150 5 (127) 35 (10.7) 5 (1.5) 2.5 (0.8)
175 5 (127) 35 (10.7) 5 (1.5) 2.5 (0.8)
200 5 (127) 50 (15.2) 5 (1.5) 2.5 (0.8)
225 5 (127) 50 (15.2) 5 (1.5) 2.5 (0.8)
250 5 (127) 50 (15.2) 5 (1.5) 2.5 (0.8)
300 6 (152) 50 (15.2) 5 (1.5) 2.5 (0.8)
350
6 (152) 50 (15.2) 7 (2.1) 3.5 (1.1)
7 (178) 50 (15.2) 4.5 (1.4) 2.25 (0.7) 6- to 7-inch (152- to 178-mm) enlarger
400
6 (152) 50 (15.2) 8 (2.4) 4 (1.2) —
7 (178) 50 (15.2) 5 (1.5) 2.5 (0.8) 6- to 7-inch (152- to 178-mm) enlarger
*Add all straight sections and equivalent lengths for elbows—the total combined length must not exceed the maximum vent length.
**Field-supplied taper-type connection required at the venter outlet.