Roberts Gorden HE25ST, HE20ST Individual Flue Connection Detail, Flue Connection Dimensions

BLACKHEAT® HE INSTALLATION OPERATION AND SERVICE MANUAL

Figure 29: Individual Flue Connection Detail

	Fan Assembly
Fan Tube
	Nut
	Lockwasher
Screw
(Torque: 2 Nm
Flue Adapter	18 in lb)
Flue Pipe

Figure 30: Flue Connection Dimensions

C

End of Tube

A

Fan Tube Fan

B

Fan Model	A	B	C
MB 56 2B M	98 mm	105 mm	52 mm
Torin DSF-133-42	79 mm	95 mm	45 mm
Torin DSA-524-202	86 mm	102 mm	51 mm
Magnetek JF1G	89 mm	102 mm	51 mm

Fan Part Number	A	B	C
90710051 (IP55)	76 mm	95 mm	31 mm
90710052 (IP55)	82 mm	101 mm	38 mm
90710053 (IP55)	82 mm	101 mm	38 mm

11.6 Outside Combustion Air Supply

Clean air must be ducted into the burner box through the 100 mm diameter spigot on the back of the burner box.

See Page 49, Section 11.3 for recommendations on duct length. Air duct should be as straight as possible. Consult the manufacturer if more than 1 x 90° bend is necessary. The fresh air duct must be self supporting.

11.6.1 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 51, Figure 31).

•The flue and fresh air supply must penetrate the roof at a minimum of 1,000 mm apart.

(See Page 51, Figure 31).

•The flue must penetrate 1,000 mm higher than the fresh air inlet on the same wall. (See Page 51, Figure 31).

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