Exhaust Fans EM 50 Exhaust Fan EM 50 EM50 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.a The square fan housing and air conveyor (venturi) are made of a strong galvanised sheet-steel. The 6-blade propeller is statically and dynamic balanced for low noise and low vibration. The propeller is available in stainless steel, galvanised steel and pre-coated and galvanised steel. 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 airtightness have been verified by personnel of the BESS Lab at the Agricultural Engineering Department, University of Illinois – USA. Propeller and shutter The propeller is attached to a large v-belt pulley in which is embedded a double ball bearing protected against water. The belt transmission ensures low propeller rpm, which ensures 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 hinders the shutter from being closed by air pressure, keeping the efficiency of the fan at a peak at all times by keeping 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 acetalic plastic with UV protection. Equipment Fan housing and venturi made of strong galvanised sheet-steel. Shutters are made of pressed galvanised steel in order to ensure highest strength. Each motor is individually tested for 100% quality control. Central hub and v-belt pulley are made from die-cast aluminium. Welded wire guards divided into two parts ensure easy maintenance. Propeller is statically and dynamically balanced. Shutter bearings are maintenance free. Patented centrifugal system permits a fully and firm opening of the shutter. Shutter is opened by rotating weights placed over cen. trifugal system arms. Shutter opening is not affected by the weight of dust deposited on shutter blades. A powerful couple of springs keep the shutters firmly closed when the fan is not operating. Every fan is individually checked for quality Order Information EM50-X-X-X e.g., EM50-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 EM 50 Code Nominal power Type phases Speed Frequency [hz] Voltage [V] Current [A] rpm [w] [hp] a 735 1.0 1 single 50 230 5 1,380 b 735 1.0 1 multi* 50 230 5 1,380 c 735 1.0 1 single 60 220 – 240 5.7 1,700 d 735 1.0 3 single 50 230 / 400 3.5 / 2 1,400 e 735 1.0 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 05 hp 0.75 hp Weight of fully equipped fan1 [kg] 84 86 Nominal propeller speed [rmp] 365 430 Airflow at 0 Pa1 [m3/h] [cfm] 35,300 [20,760] 40,800 [24,000] Airflow at 20 Pa1 [m3/h] [cfm] 31,500 [18,530] 37,850 [22,260] Specific performance at 0 Pa1 [m3/wh] [cfm/w] 30.4 [17.9] 24.8 [14.6] 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 50 is developed and produced by Munters euroemme S.p.A., Italy.