Name: NDRKF - External Rotor Backward Curved Radial Fan
Brand: NVS Air

NDRKF – External Rotor Backward Curved Radial Fan

NDRKF radial fans are made of corrosion-resistant, high-quality galvanised sheet; some models can also be produced in plastic or aluminium depending on application and performance needs. All models have an external rotor motor forming a compact unit; the fan rotating on the motor housing provides efficiency and space saving. Aerodynamic backward-curved blades ensure uniform airflow and strong suction at optimum sound levels.

Mounting: The motor is fitted to the fan by press fit or fasteners. Holes in the motor cover allow easy mounting to the surface. Inlet flange is optional.

Applications: Used inside air conditioning units and duct fans. Speed can be adjusted with a linear voltage regulator on single-phase models and a frequency inverter on three-phase models.

Description

Technical Specifications

MOTOR TYPE	EXTERNAL ROTOR
BLADE DESIGN	BACKWARD CURVED
IMPELLER MATERIAL	GALVANISED SHEET
MOTOR PROTECTION CLASS	IP 44
MOTOR INSULATION CLASS	B (160–280) · F (315–560)
MAX. AIR TEMPERATURE	40 °C
MOUNTING	CAN OPERATE IN ANY POSITION

Technical Data

MODEL	VOLTAGE (V)	FREQUENCY (Hz)	POWER (W)	CURRENT (A)	CAPACITOR (µF)	SPEED (rpm)	AIRFLOW (m³/h)	SOUND LEVEL (dB(A))	INSULATION
NDRKF 160-M	230	50/60	65/75	0.29/0.33	2	2,500/2,750	346/380	44	B
NDRKF 180-M	230	50/60	80/100	0.35/0.44	2.5	2,400	500	52	B
NDRKF 220-A-M	230	50/60	65/75	0.30/0.35	1.5	2,100	700	53	B
NDRKF 220-B-M	230	50/60	100/120	0.44/0.53	3	2,450/2,750	860/965	54	B
NDRKF 225-M	230	50/60	100/135	0.46/0.62	4	2,650/2,950	1,000/1,100	54	B
NDRKF 250-M	230	50/60	155/225	0.72/1	6	2,600/2,800	1,400/1,500	54	B
NDRKF 280-M	230	50/60	200/275	0.89/1.23	7	2,600	1,850	55	B
NDRKF 315-M	230	50/60	175/185	0.97/0.81	6	1,450/1,720	2,200/2,500	53	F
NDRKF 355-M	230	50/60	200/250	0.82/1.1	6	1,400/1,650	3,100/3,600	55	F
NDRKF 400-M	230	50/60	275/400	1.39/1.9	10	1,400/1,650	4,300/5,000	60	F
NDRKF 450-M	230	50/60	390/615	1.97/2.92	10	1,350/1,600	5,750/6,800	62	F
NDRKF 500-M	230	50	780	3.5	16	1,280	7,600	64	F
NDRKF 500-T	380 Δ/Y	50	760/550	1.7/0.9	–	1,350/1,100	8,200/6,680	64	F
NDRKF 500-T	380 Δ/Y	60	920/660	2.1/1.2	–	1,500/1,100	9,100/6,680	64	F
NDRKF 560-M	230	50	1,550	7.3	25	1,250	10,150	66	F
NDRKF 560-T	380 Δ/Y	50	1,150/720	2.3/1.3	–	1,350/1,050	11,000/8,550	66	F

Paired values are for 50 Hz / 60 Hz; on 380 V Δ/Y rows values are for delta / star connection. Sound pressure level measured at 3 m. M: single-phase, T: three-phase.