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RFE160 AKU50Hz

PRESSURE/FLOW

DIMENSIONS (mm)

DFE133-2150Hz

PRESSURE/FLOW

DFE133-2050Hz

PRESSURE/FLOW

PRESSURE/FLOW

RADIALFAN

TheRFEX/RFTXrange of radial fanscomplies withATEXstandards,the technical standard for explosionprooffans.

Thenon-sparking inletcone ismade from copper andthemotorisseparatedfromtheairstream. RFEX/RFTXisavailablewith AC motor.

ATEXDUCTFAN WITHRECTANGULARCONNECTIONS

TheRKXrangeofductfanscomplieswithATEX standards,the technicalstandard forexplosion proof fans.

RKXisaductfanwithrectangularconnections whichisarefinementofourRKrange.Theinlet coneismanufactured fromnon-sparking copper andtheRKXispoweredbyahighqualityATEX approvedmotor.Thismakesthisfansasafe choiceforanumberofdifferentapplications withintheindustry.Withswing-out designas standardmakesthefaneasytomaintainand clean.

RKX isavailable with AC motor. RKXairflowsupto 4 9 6 1 \mathsf { m } ^ { 3 } / \mathsf { h } ( 1 . 3 8 \mathsf { m } ^ { 3 } / \mathsf { s } )

RFEX Page112
RFTX Page113
RKX Page115

PRESSURE/FLOW

DIMENSIONS (mm)

PRESSURE/FLOW

DIMENSIONS (mm)

RKX500x250D3ATEX

DIMENSIONS (mm)

PRESSURE/FLOW

PRESSURE/FLOW

DIMENSIONS (mm)

RKX600x300F3ATEX

PRESSURE/FLOW

DIMENSIONS (mm)

PRESSURE/FLOW

DIMENSIONS (mm)

DIMENSIONS (mm)

PRESSURE/FLOW

DIMENSIONS (mm)

DIMENSIONS (mm)

KVFU315B

PRESSURE/FLOW

DIMENSIONS (mm)

O

Backdraught shutter

Flexible silencer

O

Mounting clamp

Switch

Mounting brackets

Mounting-kit

FANWHEELSANDFANMOTORS

FANWHEELS

Ostberg use radial fans in our products.In a radial fan the air stream is angled 9 0 ^ { \circ } . the supply air enters in an axial direction and leavesthe fanwheel inaradial direction.They have either backward orforward curved impellerblades. In additionto impellersize,fan rotation speed (rpm) is a determining factor in the resulting pressure and flow. High rotation speeds lead to high flow and pressure,but higher rotation speeds also generate more sound and consume more energy.

FORWARDCURVED IMPELLER (F WHEEL)

Fanswith forward curved impellers
provide a compact solution and are most competitive at relatively high pressures, where theyalso have their highest
efficiency.
It is important when choosing a fan with a forward curved impeller to ensure that it is correctly positioned in the area shown in the diagram (Fig.1,2 and 3).
At low pressure and high airflow, a
forward curved impeller requiresa great deal of power from the motor,but the motors are often not designed for this. This is shown with a red line in the
pressure/flow diagram and referred to as "prohibited work area".Within this area, the motor overheats very quickly. One
drawback of forward curved impellers is that dirt and impurities easily get caught on the concave side of the impeller,which impairs capacity and can cause unbalance. If the impeller gets dirty, it must be
cleaned,which can be rather difficult. But a fan with a swing-out function makes this easier.

Forward curved impellersare used in some of our fans,such as RK duct fans, IRE insulated duct fan,RF and DF singleand double inlet centrifugal fansand our ATEX certified fans RFTX and RKX.

BACKWARD CURVED IMPELLER(B WHEEL)

If youchoose a fanwith backward curved impeller with the same pressure and flow asa fanwith forward curved impeller, the fanwith backward curved impeller will be larger than the forward curved.The advantage of choosing this type of fan is that the backward curved impellers have higher efficiency which means that the fan consumes less energy at the same pressure and flow.The backward curved impeller has the highest power

consumption where the efficiency rate is best (Fig.1,2 and 3). Another advantage of these fans is that the impeller does not get dirty as fast as the forward curved,and they are significantly easier to cleanwhen they do. Backward curved impellersare used in our CK,LPKB and RKB duct fans,wall fans KV.

FANMOTORS

The Ostberg range includes products with single-phase or 3-phase AC and EC motors. Our products comply with the Ecodesign directive 209/125/EC. From the 1 January 2015 a minimum efficiency of fans (motor with fan wheel) with an electric input power between 125Wand500 kW is requiredby the second tier in Commission Regulation EU 327/2011. Compliance with these requirements is indicated with the ErP 2015 sign (products with this sign are classified as "fans").

Ecodesign requrements for ventilation unitsare made in Commission Regulation EU1253/2014.The second tier of this regulation is valid since 1 Janury 2018 and sets requirements on minimum fan efficiency foruni-directional ventilation unitsas well as thermal efficiency and maximum internal specific fan power for bi-directional ventilation units. Compliance with these requirements is indicated with the ErP 2018 sign (products with this sign are classified as"ventilation units").The increased demand for energy efficiency has caused a shift in the fan motor range, from the conventional AC motor to EC motors with better efficiency and power regulation.

ACMOTOR

The products in Ostbergs range with AC motor have "AC" in the type designation Aninduction motor isan electric motor were the rotor speed is asynchronous with the input voltage frequency.

ECMOTOR

The products in Ostbergs range with EC motor have "EC"in the type designation. The EC motor (Electronically Commutated) has an electronic control unit integrated in the motor which increases efficiency by optimally controlling the windings magnetization in the motor in ratio to the rotor.

When comparing an F wheel and a B wheel at corresponding flow and pressure, the diagrams shows that F wheel has a higher pressure and the B wheel gives a better efficiency.

FIG. 1

It is important when choosing a fan with a forward curved impeller to ensure that it iscorrectly positioned in the area shown in the diagram. At low pressure and high airflow, a forward curved impeller requires a great deal of power from the motor. This is shown with a red line in the pressure/flow diagram and referred to as "prohibited work area". Within this area,the motor overheats very quickly.

FIG. 2

The backward curved impellers has the highest power consumption where the efficiency rate is best.

FIG. 3

A fan with backward curved impeller have higher efficiency, which means that the fan consumes less energy at the same pressure and flow.

FIG. 4

When choosinga fan,you must first find out the volume of air the fan is going to transport.Then you have to determine what pressure drop the fan will overcome at this flow. Using this data,you can then choose the size of the fan type you have decided.

REDUCEDFLOWWHENINCREASED PRESSURE,FIG.4

The point in the diagram that shows the current flow and pressure is called the fan's working point,which is indicated in this example by P. As the pressure is increasing in the system, the working point willmove along the fan curveand a lower flowwill be obtained. Working point P1 is moved to P2. This will increase the power consumption.

PRESSURE IN DUCT,Fig.6 AND 7
A fan's pressure is the work the fan
performs in addition to supplying a specific flow.A fan's pressure can be presented as total pressure or static pressure.
Static pressure is the pressure that in the duct works at right angles to the duct wall in relation to the pressure outside the duct. Dynamic pressure works in the duct's
longitudinal direction and is dependent on the air velocity in the duct.It is the
static current pressure that is dimensioned whenchoosing a fan for a system.It is the static pressure drop that is calculated for the duct system during the pressure drop calculation.
The static pressure added to the dynamic pressure is the fan's total pressure.
The dynamic pressure,Pd, is calculated as follows:
{ \mathsf { P d } } = \mathsf { \rho } ^ { \star } \mathsf { v } ^ { 2 } / 2 （20
\rho = air density, \mathsf {kg } / \mathsf { m } ^ { 3 } （20
\mathsf { V } = air velocity, m/s

REDUCEDFLOWWHENSPEED CONTROLLED, FIG. 5.

FIG.5

The System line (S) describes the total
ventilation system (ducts, silencers,
dampers,diffusers, etc.).
Along this system line,the working point moves fromP2to P3asthe rotation
speed (voltage) is changed.
Distinct voltage steps with e.g. a
transformer,
135V and 230V in this example,
producesdifferent fan diagrams,"rotation speed diagrams".This will reduce the
power consumption. Our fan diagramsare shown in Static
pressure,Pascals (Pa).It is this pressure that must overcome the pressure losses of the ventilation system.
The diagram shows the fan capacity at
various pointsaccording to the pressure created by ductwork system.
The digram shows the pressure in Pascals (Pa) on the vertical axisand airflow in cubic metres/seconds ( \mathsf { m } 3 / \mathsf { s } ) on the horizontal axis.

FIG. 6

Thefandiagrams can also beshown inTotal pressure. Total pressure (Pt) = Static (Ps) + Dynamic pressure (Pd). Note what pressure is shown for right data. <br>FIG. 7.

POWER/FLOWDIAGRAMS

Once you have chosen a fan,the power/ flow diagram will show you the amount of power the fan will consume at a certain flow, which will assist you in choosing an energy efficient alternative (Fig. 8).

The electrical equipment, such as rotation speed regulators and fan circuit breakers, must be dimensioned according to
technical data/rating,which will specify maximum power consumption (input) and operating current consumption within the permitted working area.
If the current consumption is higher
than the rated current, the motor will be overloaded,whichconsiderablyshortens the motor's service life.If the winding
temperature is too high,themotor's
overheating protection will be activated and the motor will stop.
We always specify the motor's input
power,but thereare fanmanufacturers who incorrectly give the motor's output power instead.
You should therefore also compare current consumption figures from different fan manufacturers.

Atstart-up,currentconsumptionis higher than rated current for a short time.This is called starting current.

Fanswith large impellers have longer starting current times.Fans with B-wheels have the highest current consumption in the middle of the curve (Fig. 9) ond fans with F-wheels have the highest current consumption at low pressures (Fig.10).

TEMPERATUREOFTRANSPORTEDAIR Inpressure/flow diagrams or in the table of technical data there are facts about highest temperature of transported air

(Fig.11).All of our fan motors have insulationclassFwhichmeansthat the thermal contact disconnects the power when the winding temperature is maximum 1 5 5 ^ { \circ } \mathsf { C } Atthis winding temperature the life time of the ball bearings is not optimal. This is why the ambient temperature isshownata lower winding temperature so the life time of ball bearings becomes optimal. The winding temperature variates in the diagrams and depending on differences in power/current consumption. The temperatures in our diagrams are given at the highestwinding temperature.

At high current consumption, the most heat is generated in the motors.This heat must be cooled away so that the motor's service life isnot affected.Most of our fans have their motors located in the airstreamand are cooled by thisairstream. If the air that moves past the motor is too warm, it will not sufficiently cool the motor. For this reason,the highest recommended ambient/air temperatures for the fan are provided.If the fan is used at higher temperatures,itsservice life will be shortened considerably and the fan's overheating protectionwill activate. The temperatures are shown in the curve at the pressure and flow where the ambient temperature is lowest.The motor can handle higher temperatures at otherpressuresand flows.Motorswith F-wheels,for example,are used at higher pressures.

SPECIFICFANPOWER,SFP

The SFP isa measurement for the size of the total powerat a specific flow/pressure and is calculated in kW/l/second (Fig.12).

FIG. 9

5.
800
600
400 2.
200 0+ 0 0.5 1.0 1.5 2.0 2.5 Backward curved impeller. Air Flow m3/s

FIG. 11

FIG. 12

2,0 1,5 1.0 ...5 2. 0 0 0,1 0,2 0,3 0,4 0,5 0,60.7 Specific fan power Air Flow m3/s

Wavelength fora pure tone. Sound wavelengthλ iscalculated asλ=c/f where f is frequency in Hz and c is the speed of sound in m/s.

ISO method: Measurements conducted inside a duct with specified design and non-reflecting connection. Measurements and calculations conducted in 1/1 octave band.

AMCA method:Measurement conducted on free-standing fan in fully soundproof room. Results in lower sound levels.

The sound level that we experience is the intensity of the pressure fluctuations that the sound consists of. Pressure fluctuations can bemeasured and given in Pascals,Pa,and are called sound pressure.

The lowest sound that the human ear can register isa pressure difference of 0.00002 Pa (hearing threshold).The highest pressure is 2 0 \mathsf { P a } (pain threshold).To make it easier to report sound levels,a logarithmic scale is used instead of Pascals.Thisscale is called Bell, or more commonly, decibel,and is abbreviated dB.The decibel scale ranges from0 dB (hearing threshold) to 120 dB (pain threshold). One advantage of this is that the human ear registers sound levels logarithmically,which means thata difference of 1dB is perceived equally across the entire scale.An increase of 6 dB equals a doubling of sound pressure,but an increase of 10 dB is required for us to perceive this increase as having doubled.

The human ear can discern a 3 dB difference in sound pressure.

SOUNDDATA

In our catalogues,we give the sound power level Lw(A) and sound pressure level Lp(A) for sound in ducts and sound that is transmitted to the surroundings (through the fan casing). Valuesare measured in accordance with ISO 3741 for sound transmitted to the surroundings from the fans,or ISO 5136 for measurements of sound power level to the ducts.Note that measurements conducted according toanotherstandard maydiffer from the measurement data in these ISO standards.

We conduct sound measurements according to the ISO method, in which the fan is measured in itscasingto provide themost realistic values. (Fig.13.) Measurements conducted on free-standing fanswithout casing result in lower sound levels. In Application of Manufacturers'Sound Data, industry organization ASHRAE in the US statesthat:"Measurementsconducted on free-standing fans have 5-10 dB lower sound levels in octave bands from 250 Hz,and lower sound levels than fans in fan casing." (Fig.14.)

MEASUREMENT INACCURACY In conjunction with the preparation of its measuringmethod forsound power levels in ducts, ISO analyzed inaccuracy in various octave bands ( 9 0 % reliability). (Fig.15.)

SOUNDPOWERLEVEL

Sound power level,Lw(A),isused to calculate the sound generated from the entire ventilation system.The system consists of components such as dampers, ducts, diffusers, grilles,etc.,all of which contribute to the total sound power for the entire system.

Thesound power level isacalculated value that specifies the source intensity or the acoustic power emitted; it does not indicate how strongly the sound is perceived. Sound power level is reported in octave bands 63- 8 0 0 0 ~ { \mathsf { H z } } and as a logarithmic composite sum Lw(A)tot.

SOUNDPRESSURELEVEL

Sound pressure level,Lp,indicates howthe sound is perceived. It is calculated in relation to a reference sound pressure,P,which is the hearing threshold,as follows: \mathsf { L } \mathsf { p } = \mathsf { 1 0 } log (P/P0)2 \angle \mathsf { p } = 2 0 logP/PO Were \mathsf { P 0 } = 2 x 1 0 ^ { - 5 } (Pa)

Sound pressure variesaccording to distance and direction from the source of the sound. The acoustic properties of the surroundings also affect sound pressure.
The sound pressure level is presented for a normally soundproofed room with an
equivalentabsorptionarea of 2 0 ~ \mathsf { m } ^ { 2 } #
A difference of 7dB corresponds to a
distance of roughly 3 m to the sound source with semi-spherical propagation of sound. In an attempt to simulate how the human ear perceives the sound at the different
frequencies,it isweighted (corrected in the octave band) to weighting curve A which is presented as Lp(A)and by the unit dB(A). (Fig.16.)

Lp= 10x.g (10Lp1/10+10Lp2/10..+\*10LpX/10)

WIRINGDIAGRAMS

4040001 Single phase

4040137 Single phase

4040153 Single phase 230 V.

WIRINGDIAGRAMS

4040193 Single phase with two speed mini switch MH

4040021 Single phase

4040194 Single phase with two speed mini switch LM

4040187 Single phase with two speed mini switch LH

4040189 Single phase with three speed manual switch

1404000004
3-phase

1404000007 Single phase with 3 speed wall mount manual switch

1404000001 Single phase

GND
485A o M=Fan motor 0 =Fan motor OWSH SW S7 % 园= C M Z ② Bue PE 0 = Brown 3d1 Z AC230V Orange Red 9= Green = Yellw

healthy indoor climate

OSTBERG supplies the world with energy efficient, top-notch ventilation products fora fresh and healthy indoor climate wherever people live，work or play