Centrifugal in-line and rectangular fans General information

Specification Noise/vibration transmission from fan to ducting and building must be avoided. Therefore the fan should not be connected directly to the ducting. Suitable isolators are available as accessory (e.g. BM..). The motors of the KD..Ex range come with positive coefficient thermistors (PTC) as standard to monitor the temperature in the windings. They are pre wired to the terminal board and must beconnected to the MSA motor protection unit (accessory). This makes the KD..Ex fans suitable for speed control via transformercontroller. The Helios range ofTSD, TSSD or RDS should be used, outside the hazardous area. Note: a minimum voltage of 95must be maintained. Air flow temperature All models are suitable for ambients between –40 °C (models K.. Ex from –20 °C) to at least+40 °C. The maximumtemperature varies between the models and can be found on the individual product page (table). If a fan is speed controlled by anelectronic controller not shownin the table this figure must be reduced by approx. 10 °C. The RADAX
® rectangular andcircular fans combine the advantages of axial fans of straight in-line air flow and therefore simple and cost effective installation with the high pressure characteristic of a centrifugal fan. There are many advantages ofthis range:–Very compact in design. –Quick installation. –Cost effective installation. –Low noise levels.–High pressure capability.–Fully speed controllable. Rectangular fans Type KS.. Rectangular fan with SwingOutmotor impeller unit. Backward curved centrifugal impeller with high efficiency and pressure characteristic.
InformationPages Design of systems, acoustic, explosion proof12-16General technical information,speed control17-19 Type KD../KW.. Centrifugal rectangular fans with forward curved impellers and low noise levels. Ranges – Overview Information for circular andrectangular fans Circular ducted fans Motor - Impeller All models incorporate an external rotor motor protected to IP 44 or IP 54 within the air flow. It conforms to VDE 0530 and 0700 with an insulation class B or F, plus moisture protection. The ball bearings are greased for life.The motors are maintenancefree, radio suppressed, speed controllable and suitable for continuous operation. The cetrifugal impellers are pressed onto the rotating part ofthe motor body and dynamically balanced to class 6.3 VDI 2060 and DIN ISO 1940 as one unit. Type RR.. Type SKLD../SKLW.. Acoustically lined rectangular fan with low noise levels on casebreakout and intake. SwingOut motor impeller unit. Backward curved centrifugal impeller with high efficiency. A popular range which is costeffective. Centrifugal in-line fans for smaller and to medium performances in nominal diameters 100 – 315 mm. Robust casing made from galvanised steel. Information about rectangular fans. For complete information see the ‘general technical information’ and descriptionson the product pages. Type RRK Alternative range made from non corrosive, impact resistantpolymers in nominal diameters 100 – 315 mm. Type RRK Ex Small explosion proof fan, 230 V for single phase supply. For ventilation of chemical, pharmaceutical laboratories,workshops and others. For in-line installation, approved for installation in zones1, 2 and II according to VDE 0165. Further information for explosionproof fans see ‘Design of ventilation systems - explosion proof’. Installation, drainage holes All models can be installed inany position. Make sure thatSwingOut areas and easy access for service and maintenance is provided.If condensation might occur(e.g. intermittent operation, high humidity or varying temperatures) the fan must be installed in a way that the condensation candrain off unhindered.If required additional holes may have to be drilled into the casing at the appropriate positions. Alternatively the duct system may have to be insulated toavoid condensation. Speed control All InlineVent
® fans are speed controllable via voltage reduction (stepless 0 – 100%). Thereforethe performance can be adapted to the requirements almost without any losses. Our speed controllers are suitable to controlvarious fans (one or more) up totheir maximum nominal output. When selecting a controller not shown in the tables allow for a 10% safety margin. Type SB.. SILENTBOX
® , the virtually noisefree solution for high performance centrifugal fans with spigot diameters from 125 – 400 mm. Air flow direction The air flow direction of centrifugal fans is fixed and cannot be reversed; but theunits are suitable for installationin any position and can be mounted accordingly. The direction of rotation and the direction of air flow are markedon the units and must be checked when installing. Noise/vibration transmission Further information about centrifugal in-line fans see ‘General technical information’ and the description on theproduct pages. from fan to ducting and buildingmust be avoided. Thus anti vibration mounts (accessories SDD/ SDZ) and flexible connector (accessory VS..) are recommended when fitting the fan to wall/ceiling and ducting. Installation, drainage holes All models can be installed inany position. Models RR..havedrainage holes on impeller and motor casing. If condensation occurs (e.g. intermittent operation, high humidity extractmedia or varying temperatures)the fan must be installed in a way that the condensation can drain off unhindered. Also the fan casing may collectcondensation inside and require insulation. Explosion poof models With regards to regulations please refer to chapter ‘Design of ventilation systems – explosion proof’ at the front ofthe catalogue. Wrong direction of rotation If the fan is operated in the wrong direction of rotation themotor will overheat and the thermal contact will trip. Typical indication of this is a very low air flow combined with high noise levels and vibration. 148