IRB 355 B1 EC | H. Östberg

IRB 355 B1 EC Updated: 2025-06-04

7890244 -

IRB 355 B1 EC-y1

Insulated duct fan.
Equipped with 50 mm of thermal and acoustic insulation makes it ideal for handling cold air.
Designed for high pressure and long, complicated duct runs.
The design prioritise functionality, durability and longevity.
Impeller with backward curved blades.
The external rotor motor has maintenance-free sealed ball-bearings and is very energy efficient.
Speed controlling can be done with the built-in potentiometer, 0-10 V alt. external control.
Integrated motor protection.
Junction box has enclosure class IP 54.
The 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.

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.

Generating diagrams...

	IRB 355 B1 EC-y1 7890244
Parameter	Value	Unit
Voltage	230	V
Phase	1	~
Frequency	50/60	Hz
Power	854	W
Current	3.76	A
Speed	2210	r.p.m.
Max. temperature of transported air	60	°C
Sound pressure level at 3 m	59	dB(A)
Weight	42.0	kg
Enclosure class	44	IP
Insulation class, motor	F
Duct connection	355	mm
Max. flow @ 0Pa	981	l/s
Max. pressure	862	Pa
Voltage range	200-277	V

Parameter	Value	Unit
(a) Manufacturer	Östberg	-
(b) Model code	IRB 355 B1 EC	-
(c) Declared type	NRVU / UVU	-
(d) Type of drive	Variable speed drive	-
(e) Type of HRS	N/A	-
(f) Thermal efficiency	N/A	%
(g) Nominal flow rate	0.631	m³/s
(h) Effective power input	0.813	kW
(i) SFP int	N/A	W/(m³/s)
(j) Face velocity	6.4	m/s
(k) Nominal external pressure	601	Pa
(l) Internal pressure drop	N/A	Pa
(n) Static efficiency	59.7	%
(o) External (and internal) leakage rate	0.19	%
(p) Filter classification	N/A	-
(q) Visual filter warning	N/A	-
(r) Sound power level	71	dB LwA
(s) Disassembly instructions	www.ostberg.com	-