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6.6 Vertical Venting Vertically-vented standard-vented heaters can be common vented (up to four heaters). For vent lengths greater than 5' (1.5 m), condensation will form. Insulation is recommended and condensation drains may be desired. Vent from the rear of the heater cabinet then run the vent vertically and use a condensate drain at the bottom of the vertical vent. Vent pipe must be sloped 1/4'' (.6 cm) for every 1' (.3 m). For 4'' (10 cm), an approved vent cap (P/N 90502102) must be used. For 6'' (15 cm) common vent, an approved vent cap (P/N 90502103) must be used. For common vertical venting of more than two heaters, See Page 12, Figure 6. A vent shall not extend less than 2' (.6m) above the highest point where it passes through a flat roof of a building. 6.7 Length Requirements If using vent lengths greater than 5' (1.5 m), condensation will form in the vent pipe. Insulation and additional sealing measures (high temperature silicone at all seams) are required. SECTION 6: VENTING The entire vent should be insulated with foil faced fiberglass insulation (1/2" thick, 1-1/2# density minimum). 6.7.1 Maximum Vent Lengths Model UHD[X][S][R] 150 - 400 Number of Elbows 40 ft (12.2 m) 1 35 ft (10.7 m) 2 30 ft (9.1 m) 3 25 ft (7.6 m) 4 20 ft (6.1 m) 5 6.8 Vent Material Vent material may be single wall 26 ga. (minimum) galvanized steel or equal thickness stainless steel. Completely seal all joints, refer to Page 9, Section 6.3. If penetrating a combustible wall or roof, a listed thimble with 2" (5 cm) clearance must be used. Where local codes permit, a single section of type B-1 vent material may be used at the roof or wall penetration instead of a thimble. Ensure vent manufacturer's clearance from vent material is maintained. Seal annular space of the type B-1 vent as well as all joints in the remaining vent. 6.9 Replacing an Existing Heater in a Venting System When replacing an existing heater in a venting system, the venting system may not be properly sized to vent the new heater. The following steps must be followed with each appliance connected to the venting system placed in operation, while any other appliances connected to the venting system are not in operation. 1. Seal any unused openings in the venting system. 2. Inspect the venting system for proper size and horizontal pitch, as required by the NFPA 54/ ANSI Z223.1 - latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition. 3. Close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building. Turn on clothes dryers and any exhaust fans, such as range hoods and bathroom exhausts so that they shall operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. 4. Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so that the appliance will operate continuously. 5. For any appliance having a draft hood, test for draft hood appliance spillage at the draft hood relief opening after five minutes of main burner operation. Use the flame of a match or candle. 6. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliances to their previous conditions of use. 7. If improper venting is observed during any of the above tests, the venting system must be corrected by a contractor qualified in the installation and service of gas-fired equipment or your local gas supplier. If the venting must be resized, use appropriate tables in (US) Appendix G of NFPA 54/ANSI Z223.1 -latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) to determine minimum size. All vent corrections must be in accordance with the appropriate local codes and the NFPA 54/ANSI Z223.1 latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada). Figure 4: Vent and Roof Detail UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 12 Figure 5: Standard Vented Heater - Vertical and Horizontal Vent Termination Figure 6: Standard Vented Heater - Common Vertical Vent Termination Model Vent Diameter Part Number UHD[X][R] 150 - 400 4" (10 cm) 90502102 SECTION 6: VENTING Figure 7: Separated Combustion Heater - Vertical and Horizontal Vent Termination Vent Termination 12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance). Air Intake Termination Vent Air Intake* Vertical Option Horizontal Option90° Bend 12" (31 cm) Minimum from wall to vent termination. 12" (31 cm) Minimum from air inlet...

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