UDX Venting Instructions
Table Of Contents
- VENTING INSTRUCTIONS FOR UNIT HEATERS (MODEL UBX: STANDARD POWER VENT BLOWER TYPE AND MODEL UDX: STANDARD POWER VENT FAN TYPE)
- GENERAL INFORMATION
- INSTALLATION
- Instructions for Commercial/Industrial Installations (Model UBX or UDX, All Unit Sizes)
- Instructions for Residential Installations (Model UDX, Unit Sizes 030, 045, 060, 075, 100, 125)
- Instructions for Commercial/Industrial or Residential Installations (Model UDX, Unit Sizes 030, 045, 060, 075, Vertical Category I)
- APPENDIX A: INSTRUCTIONS FOR ATTACHING DOUBLE-WALL TYPE B VENT PIPE TO SINGLE-WALL PIPE
- APPENDIX B: INSTRUCTIONS FOR INSTALLING FLEX-L BRANDCATEGORY III VENT PIPE
- FIGURES
- Figure 1. Roof Slope and Pitch
- Figure 2. Horizontal Vent Terminal (Commercial/Industrial Installations)
- Figure 3. Vertical Vent Terminal (Commercial/Industrial Installations)
- Figure 4. Horizontal Vent Terminal (Residential Installations)
- Figure 5. Vertical Vent Terminal (Residential Installations)
- Figure B1. Reducer and Vent Cap
- TABLES
2
CP-UBX-UDX-VENT (03-21) 1034631-0
GENERAL INFORMATION—CONTINUED
Venting Requirements—Continued
• Venting must be in accordance with local codes and with the National Fuel Gas Code Z223.1 or CAN/CSA B149.1
and B149.2, Installation Code for Gas Burning Appliances and Equipment. Local requirements supersede national
requirements.
⚠ CAUTION ⚠
• When an existing appliance is removed or replaced in a venting system, verify that the venting
system is properly sized to vent the new appliance. An improperly sized venting system may
result in the formation of condensate, leakage, and/or spillage.
• Do not intermix different vent system parts from different manufacturers in the same venting
system.
• Do not vent into an existing gravity vent or chimney.
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 I vent pipe, attach a 4-inch appliance adapter (available from the category I pipe manufacturer) directly
to the collar and then use a reducer if using 3-inch pipe.
• 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.
• Refer to Table 1 for venter (flue) outlet diameters.
Vent System Sealing
Vent system joints depend on the type of pipe being used:
• Category III pipe: follow manufacturer’s instructions for joining pipe sections—connect venter outlet or the vent
cap using secure, sealed joints that follow a procedure best suited o the style of Category III pipe being used.
• Single-wall galvanized pipe (26-gauge or heavier): secure slip-fit connections using sheet metal screws or
rivets—seal all joints and seams inside the building using aluminum tape or silicone sealant.
• Double-wall type B vent pipe: join pipe sections in accordance with the pipe manufacturer’s requirement—refer
to the illustrated instructions in APPENDIX A to connect double-wall pipe to the heater collar, single-wall pipe,
and vent cap.
Table 1. Venter (Flue) Outlet Diameter
Unit Size
030–125 150–250 300, 350, 400
Inches (mm)
4 (102) 5 (127 6 (152)
Vent System Support Requirements
• Support horizontal runs every six feet (1.8 meters).
• Support vertical runs—of type B double-wall, category I, or category III vent pipe—in accordance with the pipe
manufacturer’s requirements.
• Support vertical single-wall pipe in accordance with accepted industry practice.
⚠ CAUTION ⚠
• Do not rely on the heater to support either horizontal or vertical vent pipe.
• Use non-combustible supports on vent pipe.