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External fan «Lemax» are designed for combustion pressure venting using a forced method. This method allows using gas-fired boiler «Lemax» without specially organized natural draft flue.

External fan «Lemax» operate with single-circuit and double-circuit boilers «Lemax» of «Premium» N, «Lider» N, «Clever» and «Wise» series as well as other boilers, where installed gas valve NOVA 820.  

 

 
Type of heat exchangerSteel heat exchangerCast-iron heat exchanger
Nominal boiler heat output, kW from 7,5
to 10 kW
from 12,5 
to 16 kW
from 20
to 30 kW
from 35
to 40 kW
16 kW25 kW35 kW40 kW
Energy-independent boilermodel Smodel Mmodel Lmodel L(140)model Lmodel Lmodel L(140)model L(140)
Energy-dependent boilermodel S(C)model M(C)model L(C)model L(140C)model L(C)model L(C)model L(140C)model L(140C)
Underpressure, caused by turbo-extraction (at boiler exit), Pa 5-8 5-12 5-12 5-12 5-12 5-12 5-12 5-12
Pressure at extraction exit, Pa 40-70 40-70 40-70  40-70 40-70 40-70 40-70 40-70
Flue diameter, mm 100 130 130 140 130 130 140 140
Diameter of outlet connection, mm 80 80 80 80  80 80 80 80
Diameter of choke ring of outlet connection, mm  - - -  - 39 47 49 -
System nominal voltage, V 220 220 220 220  220 220 220 220
Rated current frequency, Hz 50 50 50 50  50 50 50 50
Noise level, dB not more than 50 50 50 50  50 50 50 50
Consuming power, W not more than 40 40 40 40 40 40 40 40
Mass, kg 3,8 3,8 3,8 3,8  3,8 3,8 3,8 3,8