The suction fan allows safer burning of lump wood in the R 25, R 50, S 25, and S 50 boilers.
For safety reasons this fan must be used as a part of basic equipment of the R 50 and S 50 boilers. Its function is among others suction of gases from the above burner space before boiler ignition.
Use of this equipment makes the process of burning product flow more effective.
