Ventilation products 60 Hz www.systemair.com

We work to gain your trust We consider your trust in us as a supplier an important goal. It is always included in our work on all levels and areas whether it's a question of cooperation, quality, deliveries or documentation. This catalogue is of course a part of this work. The idea of catalogue, which contains products for a 60 Hz power supply, is to help us explore some new markets. And it contains the most essential technical details. More detailed information is available in our online catalogue at www.systemair. com. Our product development leads the field – latest technologies in fans, motors...

Systemair reserves the right to make technical changes without prior notice 3 110V Circular duct fan/Ventiladores para conductos circulares K-EF . . . . . . . . . . . . . . . . . . . . 20 KD-EF . . . . . . . . . . . . . . . . . . 22 Square duct fans/Ventiladores conducto cuadrado KDRE-EF. . . . . . . . . . . . . . . . 24 RS-EF . . . . . . . . . . . . . . . . . . . 26 Roof fans/Ventiladores de tejado TFER-EF . . . . . . . . . . . . . . . . 28 Axial fans/Ventiladores axiales AW-EF . . . . . . . . . . . . . . . . . . 30 Wall fans/Ventiladores de pared RVF-EF. . . . . . . . . . . . . . . . . . 32...

Dal, Eidsvoll – Norway/Noruega In Eidsvoll, Norway we manufacture air handling units for the Norwegian market. The Norwegian warehouse is also located here. En Eidsvoll, Noruega, fabricamos climatizadores para el mercado noruego. El centro de distribución para noruega también se encuentra aquí. Bouctouch – Canada/Canadá In Bouctouche, Canada we primarily produce duct fans and heat exchangers for home ventilation on the North American market. En Bouctouche, Canadá, producimos principalmente ventiladores de conducto e intercambiadores de calor para el mercado norteamericano. The straight way was...

Skinnskatteberg – Sweden/ Suecia Main plant The main plant in Skinnskatteberg houses one of the company's two central warehouses and the largest production installation as well as the group's head office. Fans and accessories are produced here as stock items. Centro principal de producción El centro principal de producción de Systemair en Skinnskatteberg cuenta con uno de los dos almacenes centralizados de la empresa y del centrode producción más grande, así como de las oficinas centrales del grupo. Aquí se producen ventiladores y accesorios para stock. Klockargården Systemair's compact air handling...

6 An external rotor motor is essentially constructed like a normal non-synchronous motor, with one difference: the stator and the rotor have swapped places. The stator with its windings is at the centre of the motor, while the rotor is located in the casing itself. The motor shaft (connected to the rotor) turns on sealed ball bearings inside the stator, and the impeller or fan blades are fitted to the rotor casing. With this design, the motor and fan form a compact unit at the centre of the air stream. Because the external rotor motor's unique construction allows it to be cooled by the transported...

7 Duct fan Roof fan Room volume 80 m3 Free field Room's equiv. absorption area 20 m2 – Distance from fan (r) 3 m 4/10 m Direction factor (Q) 1 1 Difference between sound power (LW) -7 dB 23/-31 dB and sound pressure (Lp) Adjusted sound values In this catalogue, all the sound values for fans (both sound power levels and sound pressure levels) have been adjusted to the ear's sensitivity with an A filter. The sound power levels shown in the diagram are measured at the fan's inlet. Octave band apportioning of the sound pressure level is made at the fan's maximum operating efficiency. The tables show...

8 Acoustics Calculation of equivalent absorption area Aeqv Calculation of sound pressure level Estimate based on figures 1, 2 and 3 together with table 1. where S = Size of surface (m2) a = Absorption factor, depending on the material n = Number of surfaces A normally damped room in a nursing home, measuring 30 m3, is to be ventilated. According to the information in the catalogue, the directional supply-air terminal device fitted in the ceiling has a sound pressure level (LpA) of 33 dB(A). This applies to a room with a space damping equivalent to 10 m2 Sabine, or 4 dB(A). A) What will the sound...

9 Acoustics With the following values r = 1 Q = 2 (fig.1) and information about the room's dimensions, you can calculate the equivalent absorption area with the help of figure 2. The equivalent absorption area is therefore 4 m2. It is now possible to use figure 3 to establish the difference between the sound pressure and the sound power. LpA - LWA = 0 LpA = 0 + LWA Enter the LWA value which has already been calculated. LpA = 0 + 37 = 37 dB(A) A) The sound pressure level (LpA) one metre from the diffuser in this particular nursing home room is therefore 37 dB(A). This calculation has to be made...

10 Acoustics Calculation of sound pressure level where LpA = sound pressure level (dB) LwA = sound power level (dB) Q = direction factor r = distance from sound source (m) Aeqv = equivalent absorption area (m2 Sabine) Calculation of reverberation time If a room is not too effectively damped (i.e. with a mean absorption factor of less than 0.25), the room's reverberation time can be calculated with the help of Sabine's formula: where T = Reverberation time (s). Time for a 60 dB reduction of the sound pressure value V = Room volume (m3) Aeqv = The room's equivalent absorption area, m2 Calculation...

11 Example of addition There are two sound sources, 40 dB and 38 dB respectively. 1) What is the value of the total sound level? The difference between the sound levels is 2 dB and, according to the diagram, 2 dB must be added to the highest level. 1) The total sound level is therefore 42 dB. Example of subtraction The total sound level is 34 dB in a room fitted with both supply and exhaust ventilation systems. It is known that the supply system produces 32 dB, but the value for the exhaust system is not known. 2) What is the sound level produced by the exhaust system? The difference between...