Sheet 2300-12 Page 2
STANDARD INDUSTRY NOMENCLATURE Designations for Rotation and Discharge of Centrifugal Fans (AMCA Standard 2406-66)
Direction of rotation is determined from drive side of fan. On single inlet fans, drive side is always considered as the side opposite fan inlet. Drive Arrangements for Centrifugal Fans (AMCA Standard 2404-72)
ARR. 8 SWSI - For belt drive or direct connection. Arrangement 1 plus extended base for prime mover.
ARR. 9 SWSI - For belt drive. Impeller overhung, two bearings, with prime mover outside base.
ARR. 4 SWSI - For direct drive. Impeller overhung on prime mover shaft. No bearings on fan. Prime mover base mounted or integrally directly connected.
SW - Single Width SI - Single Inlet
DW - Double Width DI - Double Inlet
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