LPKB Silent 125 C1 | H. Östberg

LPKB Silent 125 C1 Updated: 2025-10-02

7540621 -

LPKB Silent 125 C1 aut tc

7540623 -

LPKB Silent 125 C1 man tc
Archived product

Product marked with this symbol has an AC motor. An induction motor is an electric motor were the rotor speed is asynchronous with the input voltage frequency.

This product is compliant with the Lot 6 directive (1253/2014) and approved for use in the EU and EFTA, also after 2018.

Low profile duct fan with circular connections.
A small and useful duct fan which are perfect for spaces with minimum height clearance.
Equipped with a built in silencer on the inlet side for an even lower sound level.
High capacity and efficiency.
Operational in both 50 and 60 Hz.
Impeller with backward curved blades.
The external rotor motor has maintenance-free sealed ball-bearings.
Integrated motor protection.
Junction box has enclosure class IP 54.
For speed control a transformer or electronic speed controller can be connected.
Fan housing is manufactured from galvanized sheet steel.
Duct connections are equipped with rubber seals.
The fan is intended to be installed in a duct system.
A duct connected fan can be installed outside or in damp environments.
The mounting brackets simplify installation in any position.
To comply with the ErP 2018 regulation, a local demand controller must be used.

Diagrams

Generating diagrams...

Variable control

User input

Air Flow (l/s)

External static pressure (Pa)

Data

Air Flow (l/s)

External static pressure (Pa)

Power (W)

Speed (r.p.m.)

Current (A)

Voltage (V)

230

Efficiency (%)

SFPv (kW/m3/s)

Change the "User input" by dragging the point, or by entering new values.

Sound data

Generating diagrams...

Technical Data

	LPKB Silent 125 C1 aut tc 7540621		LPKB Silent 125 C1 man tc 7540623 Archived product
Parameter	Value	Unit	Value	Unit
Voltage	230	V	230	V
Phase	1	~	1	~
Frequency	50	Hz	50	Hz
Optional frequency	60	Hz	60	Hz
Power	61	W	61	W
Current	0.26	A	0.26	A
Speed	2570	r.p.m.	2570	r.p.m.
Max. temperature of transported air	70	°C	70	°C
Max. temperature of transported air when speed controlled	70	°C	70	°C
Sound pressure level at 3 m	47	dB(A)	47	dB(A)
Weight	5.9	kg	5.9	kg
Enclosure class	44	IP	44	IP
Insulation class, motor	F		F
Capacitor	2	µF	2	µF
Duct connection	125	mm	125	mm
Max. flow @ 0Pa	110	l/s	110	l/s
Max. pressure	381	Pa	381	Pa
Voltage range	220-240	V	220-240	V

Product information sheet

Parameter	Value	Unit
(a) Manufacturer	Östberg	-
(b) Model code	LPKB Silent 125 C1	-
(c) SEC average climate	-25.8	kWh/m²
SEC average climate, class	C	-
SEC warm climate	-10.3	kWh/m²
SEC warm climate, class	E	-
SEC cold climate	-52.8	kWh/m²
SEC cold climate, class	A+	-
(d) Declared type	RVU / UVU	-
(e) Type of drive	Multi-speed drive (accessory)	-
(f) Type of heat recovery	None	-
(g) Thermal efficiency	None	%
(h) Max. flow rate (@100Pa)	303	m³/h
(i) Power at max. flow rate	61	W
(j) Sound power level	54	dB LwA
(k) Reference flow rate	0.075	m³/s
(l) Reference pressure difference	50	Pa
(m) SPI	0.15	W/(m³/h)
(n) Type of control/ctrl factor	Local demand control(accessory)/0.65	-
(o) External (and internal) leakage rate	0.53 (N/A)	%
(p) Mixing rate	N/A	-
(q) Visual filter warning	N/A	-
(r) Instruction supply/exhaust grilles	See manual	-
(s) Disassembly instructions	fsp.ostberg.com	-
(t) Airflow sensitivity	N/A	-
(u) Air tightness	N/A	m/s
(v) AEC	101	kWh
(w) AHS average	2830	kWh
AHS warmer	1280	kWh
AHS colder	5536	kWh

Wiring Diagram

Dimensions

Accessories

Mechanical accessories

Electrical accessories

Downloads

3D drawings

Diagrams

Generating diagrams...

Variable control

User input

Air Flow (l/s)

External static pressure (Pa)

Data

Air Flow (l/s)

External static pressure (Pa)

Power (W)

Speed (r.p.m.)

Current (A)

Voltage (V)

230

Efficiency (%)

SFPv (kW/m3/s)

Change the "User input" by dragging the point, or by entering new values.

Sound data

Generating diagrams...

Technical Data

	LPKB Silent 125 C1 aut tc 7540621 (50)/60Hz
Parameter	Value	Unit
Voltage	230	V
Phase	1	~
Frequency	60	Hz
Optional frequency	50	Hz
Power	83	W
Current	0.36	A
Speed	2740	r.p.m.
Max. temperature of transported air	60	°C
Sound pressure level at 3 m	47	dB(A)
Weight	5.9	kg
Enclosure class	44	IP
Insulation class, motor	F
Capacitor	2	µF
Duct connection	125	mm
Max. flow @ 0Pa	113	l/s
Max. pressure	509	Pa
Voltage range	220-240	V

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