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Eclipse AirHeat v1.0 - Installation Guide No. 140, 11/4/03
Figure 5–Mounting & Duct Lengths
• Provide at least 3" (76 mm) clear-
ance between burner and top, bot-
tom and sides of the duct.
• Profile plates are not required for
good burner operation, but uni-
form velocity must be maintained
for full length of burner. If velocity
is not uniform, profile plates can
be used to correct this condition.
In-Duct Sealed
Duct Press: +0.2" to –0.5" w.c.
+0.5 to –1.2 mbar
Slot-Fired
Duct Press: 0" to –0.5" w.c.
0 to –1.2 mbar
Guidelines for All Mounting Arrangements
• Center the burner in the duct.
• Allow a minimum of 46" (1168 mm) from burner to nearest point
of possible flame impingement at an input of 1,000,000 Btu/hr.
(962 kW/m).
• On burners longer than 36" (914 mm), use a hanger or a pedes-
tal to support the blower and motor.
Duct Lengths
Min./Max. Velocity: 500 to 6000 fpm
2.54 to 30.48 m/s
1000 to 4000 fpm
5.08 to 20.32 m/s
Optimum Velocity:
Min./Max. Velocity: 500 to 1200 fpm
2.54 to 6.10 m/s
Min./Max. Velocity: 500 to 1200 fpm
2.54 to 6.10 m/s
Min./Max. Velocity: 500 to 1200 fpm
2.54 to 6.10 m/s
Min./Max. Velocity: 500 to 1200 fpm
2.54 to 6.10 m/s
Min./Max. Velocity: 500 to 6000 fpm
2.54 to 30.48 m/s
1000 to 4000 fpm
5.08 to 20.32 m/s
Optimum Velocity:
Minimum Distance Before
Possible Flame Impingement = 46"
AH
Burner
Minimum Distance Before Transition
Rectangular Ducts: One Height or Width, Whichever is Greater
Round Ducts: One Diameter
7.5°
Maximum
Air Flow