Bananza UHD 125 Installation, Operation & Service Manual - page 22

 UHD L

OW

 P

ROFILE

 D

UCT

 F

URNACE

 I

NSTALLATION

 O

PERATION

AND

 S

ERVICE

 M

ANUAL

14 of 47

7.7.1 Maximum Vent Lengths 

7.8 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 12, Section 

7.3.

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.

7.9 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 8: Vent and Roof Detail

Model UHD[X][S] 75, 100, 125

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