Circular Case Mixed Flow Fans

MFC series Mixed Flow ‘Circular’ Ducted Fans Advanced, flexible performance fan technology Contents Multiflow Technology Performance Data Electrical Data Dimensional Data • Less space • In-line or end of duct fitting Mounting Arrangements Other Elta Products Multiflow MFC benefits • More performance Multiflow is a trade name of Elta Fans

Multiflow Technology Benefits Advanced fan engineering Elta Multiflow technology provides for the first time, the ability to select a single direct driven mixed flow fan that can meet a wide selection of alternative performance contours and duty requirements. With fixed The secret of Elta Multiflow blade designs, the choice is to either make a selection from a limited technology lies in its extensively number of fixed performance contours or, consider the more costly researched and patented mixed and less space efficient belt driven variants. flow impeller, which incorporates adjustable blade...

Mixed Flow Air Performance Benefits • Non-stall characteristic The inherent aerodynamic benefits of good mixed • Non-overloading power curve flow impeller design provide marked advantages • Wide operating range over conventional axial and centrifugal air performance characteristics. Mixed flow ‘non-stall’ • Greater pressure capability than axial fans airflow properties and a non-overloading absorbed power curve allow a wide range of operating • Greater airflow capability than centrifugal fans Comparative curves MULTIFLOW ‘MIXED FLOW’ Multiflow, mixed flow performance can provide clear benefits...

Standard Multiflow MFC Range The Multiflow MFC fan range has been designed to provide customers with all the inherent benefits of Elta mixed flow technology by optimising design and performance choice. 9 fan sizes each with 2 alternative speeds and a selection of 5 alternative, factory set impeller blade angles for each model, provide an impressive choice Motor and stator Guide Vanes of 90 standard model/performance options. MFC Standard supply comprises Fully cased, cylindrical model with circular mounting flanges at both ends. Wired terminal box, ready for customer installation.

Basic Fan Model Reference Improved Performance The unique design of Multiflow MFC fans enables required performance to be achieved from a smaller airstream leaving a Multiflow MFC impeller being more axially orientated. This permits the casing to be closer fan size than is normally achievable with typical conical style, fixed blade mixed flow fans. This is due to the to the impeller periphery, without incurring losses and thereby retaining excellent air performance, power and sound levels. Also, as Multiflow MFC incorporates an impeller of relatively wide air passage design, the resultant air...

Airflow Performance Data Elta fan performance data is achieved through exhaustive testing in the Company’s laboratory and provides an accurate and reliable record of the MFC series performance. Testing has been performed for Type D installation category (fully ducted) to the following current standards. Aerodynamic Performance To ISO 5801 : 1997 (incorporating BS 848 Part 1:1997) Sound Performance To BS 848 Part 2 : 1985 on both Inlet and Outlet sides Pressure Values The ISO 5801 standard suggests that fan pressure should be shown as total or stagnation values, with static pressure illustrated...

How to read Air Performance Data – typical example Model Reference Impeller Speed MFC315 1440 rpm Fan Series Casing Dia (mm) Density 1.2kg/m3 Sound Level spectra when Values shown are the overall In-duct Sound Power levels refer to Sound Level notes and table below. below this contour 71 Overall inlet side variations are shown in sound level 60 data below. Pd, Fan Dynamic Pressure Curve Volume/Pressure Characteristic Impeller Blade Setting selected blade angle opposite page. Factory pre-set blade angle setting reference. Customers specify 1 to Selection Example An airflow of 0.24 m3/sec against...

0.10 Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Inlet side values vary by +1dB. Inlet side values vary by +0dB. The overall dBW values may be adjusted by the ‘A’ reductions in the table below, so as to result in the mean free field spherical radiated dBA value at 3 metres. dBA values should be used for comparative purposes only. The...

0.4 0.2 Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Inlet side values vary by +1dB. Inlet side values vary by -1dB. The overall dBW values may be adjusted by the ‘A’ reductions in the table below, so as to result in the mean free field spherical radiated dBA value at 3 metres. dBA values should be used for comparative purposes only....

0.05 Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Inlet side values vary by +1dB. Inlet side values vary by +1dB. The overall dBW values may be adjusted by the ‘A’ reductions in the table below, so as to result in the mean free field spherical radiated dBA value at 3 metres. dBA values should be used for comparative purposes only. The...

0.05 0.1 Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Sound Level The values shown on the performance curve above are the overall In-duct Sound Power levels on the outlet side of the fan unit. (rel. to 1pW). Inlet side values vary by +1dB. Inlet side values vary by +1dB. The overall dBW values may be adjusted by the ‘A’ reductions in the table below, so as to result in the mean free field spherical radiated dBA value at 3 metres. dBA values should be used for comparative purposes only....