CK 250 A1 | H. Östberg

CK 250 A1 Updated: 2025-10-02

7000433 -

CK 250 A1-v1

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.

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 250 A1-v1 7000433
Parameter	Value	Unit
Voltage	230	V
Phase	1	~
Frequency	50	Hz
Optional frequency	60	Hz
Power	126	W
Current	0.56	A
Speed	2650	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	42	dB(A)
Weight	4.0	kg
Enclosure class	44	IP
Insulation class, motor	F
Capacitor	4	µF
Duct connection	250	mm
Max. flow @ 0Pa	265	l/s
Max. pressure	413	Pa
Voltage range	220-240	V

Product information sheet

Parameter	Value	Unit
(a) Manufacturer	Östberg	-
(b) Model code	CK 250 A1	-
(c) Declared type	NRVU / UVU	-
(d) Type of drive	Multi-speed drive (accessory)	-
(e) Type of HRS	N/A	-
(f) Thermal efficiency	N/A	%
(g) Nominal flow rate	0.159	m³/s
(h) Effective power input	0.126	kW
(i) SFP int	N/A	W/(m³/s)
(j) Face velocity	3.2	m/s
(k) Nominal external pressure	237	Pa
(l) Internal pressure drop	N/A	Pa
(n) Static efficiency	29.0	%
(o) External (and internal) leakage rate	0.25 (N/A)	%
(p) Filter classification	N/A	-
(q) Visual filter warning	N/A	-
(r) Sound power level	49	dB LwA
(s) Disassembly instructions	fsp.ostberg.com	-

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 250 A1-v1 7000433 (50)/60Hz
Parameter	Value	Unit
Voltage	230	V
Phase	1	~
Frequency	60	Hz
Optional frequency	50	Hz
Power	166	W
Current	0.73	A
Speed	2990	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	42	dB(A)
Weight	4.0	kg
Enclosure class	44	IP
Insulation class, motor	F
Capacitor	4	µF
Duct connection	250	mm
Max. flow @ 0Pa	282	l/s
Max. pressure	501	Pa
Voltage range	220-240	V

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