Exhaust Fans EM 50n Exhaust Fan EM 50n EEM50n is a further development of the well-recognized and proven EM50 and is the ideal exhaust fan whenever extra high airflow capacity is required. The unique propeller design is self-cleaning and allows the highest efficiency to be reached, features which characterize the high quality and excellent performance E-line product segment. The square fan housing and air conveyor (venturi) are made of a strong galvanised sheet-steel. The 6-blade propeller is statically and dynamically balanced for low noise and low vibration. The propeller is available in stainless steel, galvanised steel and precoated galvanised steel. The v-belt pulley attached to the propeller is made of die-cast aluminium, with reinforced ribs which will increase strength. To improve aerodynamic efficiency, the fan has been developed in Munters Euroemme’s R&D lab. The test chamber has been built according to ANSI/AMCA 210-85 Figure 15 specifications. Construction details and air tightness have been verified by personnel of the BESS Lab at the Agricultural Engineering Department,University of Illinois – USA. All declared values in this leaflet are measured and certifiedby BESS Lab (test #02333 and #02332). Propeller and shutter The propeller is attached to a large v-belt pulley, featuring a new and improved design, in which is embedded a double ball bearing protected against water. The belt transmission ensures low propeller rpm, which in turn entails high efficiency and low energy consumption as well as low noise. The shutter is made of galvanised steel for all models, which is stronger than aluminium and plastic. The fan shutter is tightly closed when the fan is not working, preventing any air leakage through the fan. The patented centrifugal system consisting of rotating weights, which are placed over the system arms, hinders the shutter from being closed by air pressure. This keeps the efficiency of the fan at a peak at all times by maintaining the shutter fully and firmly opened. The shutter does not have to be cleaned regularly as dust does not affect its opening and closing movement. All the plastic parts are made of black acetalic plastic with UV protection. The motor slide has been given a special design which will reduce stress on the motor bearings and the new high efficiency electric motor results in a longer life time along with energy savings. A special plastic support fixes the mesh, thereby eliminating any vibrations. Equipment Central hub and v-belt pulley are made from die-cast aluminium, with reinforced ribs for prolonged lifetime Reduced stress on motor bearings Class A motor featuring excellent effi- ciency and low energy consumption Each motor is individually tested for 100% quality control Fan housing and venturi made of strong galvanised sheet-steel Welded wire guards designed for easy maintenance fitted with noise reduc- tion supports Propeller is statically and dynamically balanced Shutters are made of pressed gal- vanised steel in order to ensure high- est strength Shutter bearings are maintenance free Patented centrifugal system permits an energy efficient solution Dust-safe opening and closing Powerful springs keep shutters firmly closed when fan is not operating Every fan is individually checked for quality Curves refer to data measured on EM50n by Bess Lab. Em50n is equipped with a high efficiencyelectric motor. V-blet pulley in a new and improveddesign. Order Information EM50n-X-X-X e.g., EM50n-b-2-wp-wm b : Code for electric motor according to above table. 2 : Code for the type of propeller blades. Galvanised propeller blades. Precoated propeller blades. Stainless steel propeller blades. wp-wm : Options codes wp: Fan equipped with plastic CE protection for belt and pulleys (on mesh side, standard in Europe) np: Fan delivered without plastic CE protection for belt and pulleys ( on mesh side, standard outside Europe) wm: Fan delivered with pyramidal shape mesh for CE protection on shutter side. nm: Fan delivered without pyramidal shape mesh for CE protection on shutter side (standard) Motor Specifications EM50n Code Nominal Power Type phases Speed Frequency[Hz] Voltage[V] Current[A] rpm [W] [hp] a 735 1 1 single 50 230 5 1,380 b 735 1 1 multi* 50 230 5 1,380 c 735 1 1 single 60 220-240 5.7 1,700 d 735 1 3 single 50 230/400 3.5/2 1,400 e 735 1 3 single 60 230/400 3.5/2 1,700 f 880 1.2 3 multi* 50 230/400 4.3/2.5 1,380 g 880 1.2 3 multi* 60 230/400 4.3/2.5 1,600 h 1,100 1.5 1 single 50 230 7.3 1,400 i 1,100 1.5 1 single 60 220-240 7.3 1,700 k 1,100 1.5 3 single 50 230/400 5.2/3 1,400 l 1,100 1.5 3 multi* 50 230/400 5.2/3 1,380 m 1,100 1.5 3 single 60 230/400 5.2/3 1,700 n 1,100 1.5 3 multi* 60 230/400 5.2/3 1,670 * Multi speed motors must be regulated with auto-transformer which is not supplied. Technical Specifications 1.0, 1.2 hp 1.5 hp Weight of fully equiped fan1 [kg] 84 86 Nominal propeller speed [rmp] 368 427 Airflow at 0 Pa1 [m3/h] [cfm] 36,180 [21,300] 42,125 (24,800) Airflow at 25 Pa1 [m3/h] [cfm] 31,594 (18,600) 38,048 (22,400) Airflow at 50 Pa1 [m3/h] [cfm] 25,139 [14,800] 33,293 [19,600] Specific performance at 0 Pa1 [m3/wh] [cfm/w] 34.5 [20.3] 28.0 [16.5] Propeller diameter [mm] [inch] 1,270  Number of blades 6 Number of shutter blades 10 Max. operating temperature [°C] [°F] 50  IEC protective class of electric motor IP55 Electric motor winding insulation grade F 1 All values refer to 3 phases 50 Hz single speed motor. N.B Airflow data are measured at standard condition (20 °C, 1013 hPa). EM 50n is developed and produced by Munters euroemme S.p.A., Italy.