Figure 5–Mounting & Duct Lengths
In-Duct
Min./Max. Velocity: 500 to 6000 fpm 2.54 to 30.48 m/s
Optimum Velocity: 1000 to 4000 fpm 5.08 to 20.32 m/s
•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.
Sealed
Duct Press: +0.2" to –0.5" w.c. +0.5 to –1.2 mbar
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
Slot-Fired
Duct Press: 0" to –0.5" w.c. 0 to –1.2 mbar
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
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.
Min./Max. Velocity: 500 to 6000 fpm 2.54 to 30.48 m/s
Optimum Velocity: 1000 to 4000 fpm 5.08 to 20.32 m/s
Duct Lengths
Minimum Distance Before Transition
Rectangular Ducts: One Height or Width, Whichever is Greater
Round Ducts: One Diameter
7.5°
Maximum
Air Flow
AH
Burner
Minimum Distance Before
Possible Flame Impingement = 46"
Eclipse AirHeat v1.0 - Installation Guide No. 140, 11/4/03 | 5 |
