Axial fans

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Single and dual inlet centrifugal blowers with forward curved blades The forward curved centrifugal impeller must always be operated inside a scroll housing. A dual inlet centrifugal blower shows the same behaviour as two single inlet blowers operated in parallel: with size, speed and pressure being identical, double the air flow is achieved. Operating range Middle part of air performance curve: – Maximum efficiency – Minimal noise – Higher performance density than with the backward curved centrifugal fan To the right and the left of the middle part of the air performance curve: – Reduced efficiency – Increasing noise The optimum operating range of the fan is shaded in green in the curve given here. Noise / efficiency curve [Pa] [%] [dB(A)] optimum operating range 0 0 [m³/h] Dimensioning of the scroll The dimensions of a typical scroll can be calculated with the following formulae, subject to the impeller diameter D: C D B 45˚ 45˚ 45˚ J A K 45˚ E 45˚ 26˚ 45˚ F H G A = 1.062 · D B = 0.992 · D C = 0.922 · D D = 0.853 · D E = 0.784 · D F = 0.715 · D G = 0.646 · D H = 0.612 · D J = 0.720 · D K = 0.689 · D R = 0.073 · D Adjusting the dimensions to diminished mounting spaces is possible. R 404
Technology AC axial A series EC axial <strong>fans</strong> EC axial S series AC axial K series AC axial S series AC axial <strong>fans</strong> General information Effects of step diffusers A diffuser mounted on the exhaust side with connected exhaust tunnel increases air performance and efficiency of the centrifugal blower. Curve [Pa] [%] 1 without step diffuser 2 with step diffuser 1 2 1 2 0 0 [m³/h] Effects of obstructions on the intake side Obstructions on the air intake side reduce the air performance of the centrifugal blower. Curve [Pa] Q-motor 1 x / D = ESM 2 x / D = 30 % 3 x / D = 23 % D 4 5 x / D = 15 % x / D = 7.5 % EC-SYSTEMS X X 0 0 5 4 3 2 1 [m³/h] Accessories 405 Contacts
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Axial fans version 07 The engineer
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Axial fans

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