The reliable Smart-Fan® MultiSD is a speed control and temperature alarm for dc fans and blowers that regulates temperature while reducing acoustical noise, says the manufacturer. The MultiSD includes a diode O-ring and fused dual power feeds with a 10- to 75-vdc range. The unit has jumper-selectable 12-, 24-, or 48-vdc operation, multiple sensor inputs, fan current limiting, and a full-speed override input, the company says. The unit measures 1-1/2 in. by 5 in. The maximum fan current is 4.0 A (still air) and 5.0 A (200 ft/min airstream) at 55 degrees C, says the company.

Control Resources, Inc., 11 Beaver Brook Rd., Littleton, MA 01460; 978-486-4160; 978-486-4772 (fax); sales@ (e-mail); (website).

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