UDZ 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
Figure 12. Option CC6 Components
Install the horizontal vent kit as follows:
⚠ DANGER ⚠
• To prevent combustion products from entering the occupied space, all vent terminals must be
positioned or located away from fresh air intakes, doors, and windows. Failure to comply could
result in severe personal injury or death and/or property damage.
• In climates with below freezing temperatures, condensate may form icicles on the vent terminal.
Locate the terminal where falling icicles do not present a hazard.
1. Determine vent/combustion air terminal location on outside wall:
a. Refer to Pipe Size Requirements section to ensure that location complies with vent length requirements.
b. For most applications, ensure that vent terminal is level with heater mounting height.
c. Allow downward pitch of 1/4-inch per foot (6 mm per 305 mm) for condensate drain.
NOTE: Local codes supersede all provisions in these instructions and in National Fuel Gas Code
Z223.1.
d. Ensure that distance of vent terminal from adjacent public walkways and buildings and window and building
openings complies with local codes. Absent any local codes, distance must comply with National Fuel Gas
Code Z223.1.
⚠ DANGER ⚠
Consider local snow depth conditions. The vent must be at least 6 inches (152 mm) above the
anticipated snow depth.
⚠ WARNING ⚠
Avoid positioning the vent terminal above a walkway as there may be a small amount of condensate
that drips from the end of the vent/combustion air terminal. In cold climates, the condensate may
form icicles.
⚠ CAUTION ⚠
Products of combustion can cause discoloration of some building finishes and deterioration of
masonry materials. A clear silicone sealant normally used to protect concrete driveways may be
used to protect masonry materials from discoloration and deterioration. If discoloration is an
esthetic problem relocate the vent or install a vertical vent.
EXHAUST GRILL
INLET GUARD
INSTALLATION—CONTINUED
Vent Terminal Options—Continued
Horizontal Vent Terminal (Option CC6) Installation—Continued
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CP-UBZ-UDZ-VENT (02-21) 1034632-0