CK 125 A1 | H. Östberg

CK 125 A1 Updated: 2025-10-02

7000037 -

CK 125 A1 aut tc

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.

Duct fan with circular connections.
Proven performance and reliability.
Compact with high capacity and efficiency.
Low sound levels.
Operational in both 50 and 60 Hz.
Impeller with backward curved blades.
The external rotor motor has maintenance-free sealed ball-bearings and is very energy efficient.
For speed control a transformer or electronic speed controller can be connected.
Integrated motor protection.
Junction box has enclosure class IP 54.
Fan housing is manufactured from galvanized sheet steel.
The fan is intended to be installed in a duct system.
A duct connected fan can be installed outside or in damp environments.
Easy 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

	CK 125 A1 aut tc 7000037
Parameter	Value	Unit
Voltage	230	V
Phase	1	~
Frequency	50	Hz
Optional frequency	60	Hz
Power	41	W
Current	0.18	A
Speed	1960	r.p.m.
Max. temperature of transported air	70	°C
Max. temperature of transported air when speed controlled	70	°C
Sound pressure level at 3 m	35	dB(A)
Weight	2.6	kg
Enclosure class	44	IP
Insulation class, motor	F
Capacitor	3	µF
Duct connection	125	mm
Max. flow @ 0Pa	88	l/s
Max. pressure	300	Pa
Voltage range	220-240	V

Product information sheet

Parameter	Value	Unit
(a) Manufacturer	Östberg	-
(b) Model code	CK 125 A1	-
(c) SEC average climate	-25.4	kWh/m²
SEC average climate, class	C	-
SEC warm climate	-9.9	kWh/m²
SEC warm climate, class	F	-
SEC cold climate	-52.5	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	N/A	-
(g) Thermal efficiency	N/A	%
(h) Max. flow rate (@100Pa)	175	m³/h
(i) Power at max. flow rate	40	W
(j) Sound power level	42	dB LwA
(k) Reference flow rate	0.066	m³/s
(l) Reference pressure difference	50	Pa
(m) SPI	0.17	W/(m³/h)
(n) Type of control/ctrl factor	Local demand control(accessory)/0.65	-
(o) External (and internal) leakage rate	0.46 (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	114	kWh
(w) AHS average	2830	kWh
AHS warmer	1280	kWh
AHS colder	5536	kWh

Wiring Diagram

Dimensions

Accessories

Mechanical accessories

Electrical accessories

Downloads

Manuals

EU Declarations

EU Declaration Fans u10_eng.pdf

Product Declarations

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

	CK 125 A1 aut tc 7000037 (50)/60Hz
Parameter	Value	Unit
Voltage	230	V
Phase	1	~
Frequency	60	Hz
Optional frequency	50	Hz
Power	48	W
Current	0.21	A
Speed	1780	r.p.m.
Max. temperature of transported air	60	°C
Max. temperature of transported air when speed controlled	60	°C
Sound pressure level at 3 m	31	dB(A)
Weight	2.6	kg
Enclosure class	44	IP
Insulation class, motor	F
Capacitor	3	µF
Duct connection	125	mm
Max. flow @ 0Pa	83	l/s
Max. pressure	395	Pa
Voltage range	220-240	V

LOGIN