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SECTION 11: VENTING
51 of 75
Figure 30: Individual Flue Connection Detail
Figure 31: Flue Connection Dimensions
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)
Fan Tube
Flue Pipe
Flue Adapter
Fan Assembly
Screw
(Torque:2 Nm
18 in lb)
Lockwasher
Nut
Fan Tube
Fan
A
B
C
End of Tube
Heater Model Fan Model A B C Part Number
BH 15-30 Torin DSF-133-42 79 mm 95 mm 45 mm C2374B
BH 35-50 AO Smith JF1G 89 mm 102 mm 51 mm 90710000