Outside Combustion Air Supply; Figure 30: Individual Flue Connection Detail; Figure 31: Flue Connection Dimensions - Roberts Gorden Blackheat BH15UT Installation, Operation & Service Manual

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.
End of Tube
Fan Tube
Fan Model A
MB 56 2B M 98 mm 105 mm 52 mm
Torin DSF-133-42 79 mm 95 mm
Torin DSA-524-202 86 mm 102 mm 51 mm
Magnetek JF1G 89 mm 102 mm 51 mm
C
Fan
B C
45 mm
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)
SECTION 11: V
A
B
51 of 75
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