Venting Instructions
Table Of Contents
- VENTING INSTRUCTIONS FOR UNIT HEATERS (MODEL UBZ: SEPARATED-COMBUSTION BLOWER TYPE AND MODEL UDZ: SEPARATED-COMBUSTION FAN TYPE)
- GENERAL INFORMATION
- INSTALLATION
- APPENDIX: INSTRUCTIONS FOR ATTACHING DOUBLE-WALL TYPE B VENT PIPE TO SINGLE-WALL PIPE
- FIGURES
- Figure 1. Typical Combustion Air Inlet and Venter Outlet Connections
- Figure 2. Concentric Adapter Box
- Figure 3. Concentric Adapter Box Dimensions (Refer to Table 4)
- Figure 4. Concentric Adapter Box Connections (Refer to Table 4)
- Figure 5. Vent Terminal Options
- Figure 6. Option CC2 Components
- Figure 7. Option CC2 Installation
- Figure 8. Concentric Adapter Box Brackets
- Figure 9. Combustion Air Pipe Installation
- Figure 10. Combustion Air Pipe Through Roof
- Figure 11. Combustion Air Inlet and Vent Terminal
- Figure 12. Option CC6 Components
- Figure 13. Option CC6 Installation
- TABLES
- Table 1. Combustion Air Inlet and Venter Outlet Connection Sizes
- Table 2. Concentric (Outdoor) Pipe Sizes
- Table 3. Diameter and Length of Pipe from Heater to Concentric Adapter Box
- Table 4. Vent Pipe Opening Diameter
- Table 5. Concentric Adapter Box Vent Pipe Sizes
- Table 6. Vertical Vent Terminal/Combustion Air Package (Option CC2) Components
- Table 7. Minimum Spacing Between Center Lines of Vertical Vent Pipes
- Table 8. Horizontal Vent Terminal/Combustion Air Package (Option CC6) Components
- Table 9. Minimum Clearance Requirements for Horizontal Vent Termination Location
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CP-UBZ-UDZ-VENT (02-21) 1034632-0
INSTALLATION—CONTINUED
Vent Terminal Options—Continued
Vertical Vent Terminal (Option CC2) Installation—Continued
6. Secure concentric adapter box to underside of roof (see Figure 9):
⚠ CAUTION ⚠
• If the roof is combustible, ensure that brackets are positioned to allow a 2-inch (51 mm) clearance
between the concentric adapter box and the roof.
• If any holes are made in the concentric adapter box in error, ensure that they are sealed.
a. Insert combustion air pipe through roof as shown in Figure 10.
b. Position concentric adapter box to match pipe runs and secure short angles of concentric adapter brackets
(see Figure 8) to underside of roof using field-supplied hardware.
c. Install field-supplied flashing around combustion air pipe on roof outside.
Figure 10. Combustion Air Pipe Through Roof
7. Install terminal-end vent pipe:
NOTE: The length of the terminal-end vent pipe is determined by the installation within maximum
and minimum requirements. The vent pipe extending through the concentric adapter box, through
the combustion air inlet pipe, and above the combustion air inlet air pipe must be one piece without
joints. If the actual piece of vent pipe is longer, extend it further above the combustion air pipe. Do
not extend it more than 6 inches (152 mm) below the box.
a. Refer to Figure 9 to determine required length of continuous section of vent pipe. Determine length as follows:
1) start with no more than 6 inches (152 mm) below concentric adapter box, 2) plus 6 inches (152 mm) through
box, 3) plus length of bracket extending above box, 4) plus width of roof, 5) plus height of combustion air pipe
above roof, 6) plus minimum of 3 inches (76 mm) beyond top of combustion air pipe—total is minimum length
of vent pipe section.
b. Ensure that vent pipe is in proper flow direction and slide end of pipe into box and out through combustion air
pipe. Position vent pipe to lengths determined above.
NOTE: The terminal-end vent pipe does not attach to the box. The installer must provide support.
c. For commercial/industrial installations, connect double-wall pipe to single-wall pipe or taper-type connector
in accordance with APPENDIX.
d. Seal completely around circumference of pipe and opening of box using silicone sealant.