SECTION 11: VENTING
Figure 30: Individual Flue Connection Detail
| Fan Assembly |
Fan Tube | |
| Nut |
| Lockwasher |
Screw | |
(Torque: 2 Nm | |
Flue Adapter | 18 in lb) |
| |
Flue Pipe |
|
Figure 31: Flue Connection Dimensions
C 
End of Tube
A
Fan Tube | Fan |
B
Heater Model | Fan Model | A | B | C | Part Number |
BH | Torin | 79 mm | 95 mm | 45 mm | C2374B |
BH | AO Smith JF1G | 89 mm | 102 mm | 51 mm | 90710000 |
11.3 Outside Combustion Air Supply
Where necessary, clean air may be ducted into the burner box through an added spigot on the back of the burner box replacing the existing dust arrest baffle plate.
See Page 50, Section 11.1.3 for recommendations on duct length. Air duct should be as straight as possible. Do not use bends in excess of 45°. Consult the manufacturer if more than 2 x 45° offset bends are necessary. The fresh air duct must be self supporting.
11.3.1 Air Supply Requirements
When fresh air duct is used, follow one of these rules:
•The flue must penetrate the roof while fresh air can penetrate any wall. (See Page 52, Figure 33)
•The flue and fresh air supply must penetrate the same roof, at a minimum of 1 m apart. (See Page 52, Figure 33)
•The flue must penetrate 1 m higher than the fresh air inlet on the same wall. (See Page 52, Figure 33)
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