Comparison : |
Item # MDS420-24, 1.65 in. (40 mm) MD Series S Type (Standard) Axial Fan (24 VDC) Item # MDA420-24L, 1.65 in. (40 mm) MD Series A Type (with Alarm) Axial Fan with Stall Alarm - Electronic (24 VDC) Item # MDV420-24S, 1.65 in. (40 mm) MD Series V Type (Variable Speed) Axial Fan with Pulse Sensor (24 VDC)
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