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UBXC-UDXC-IOM (01-24) 1042980-0
Category III Commercial/Industrial Installations
A commercial/industrial installation may have either a horizontal or a vertical vent run. Install the vent as follows:
1. Select vent pipe (refer to Table 14). For either horizontal or vertical vent run, select vent pipe approved to UL
standard 1738 for Category III appliance or appropriately-sealed 26-gauge or heavier galvanized steel or equivalent
single-wall pipe. If at least 75% of equivalent length of the vent run is vertical, select double-wall Type B vent
pipe. If connecting double-wall pipe to heater, follow instructions in Figure 8.
2. Determine vent pipe diameter and length. Minimum vent length is 3 feet (1 meter). Use only one diameter of vent
pipe for installation (refer to Table 13).
3. Determine venter (flue) outlet diameter (refer to Venter (Flue) Outlet Diameter section).
4. Make all vent pipe joint connections in accordance with Vent System Sealing section.
5. Properly support all vent pipe runs in accordance with Vent System Support Requirements section.
6. Take appropriate steps to mitigate condensation in accordance with Condensation Mitigation section.
NOTE: Ensure that terminal vent pipe is double-wall Type B pipe.
7. Terminate vent as follows:
a. Install double-wall Type B terminal vent pipe (connect in accordance with Figure 8) and terminate vent with
option CC1 or CC21 vent cap or approved Category III vent cap.
b. Refer to instructions shown in Figure 11 to install horizontal vent terminal.
c. Refer to instructions shown in Figure 12 to install vertical vent terminal.
d. Ensure that vent terminal is installed in accordance with Vent Terminal Requirements section.
Category III vent pipe
Reznor (option CC1)
or approved Category III
vent cap (Note positions
(shaded areas) of vent
cap openings.)
Figure 11. Horizontal Vent Terminal (Commercial/Industrial Installations)
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