Mount M91xx Series actuators in any convenient orientation. Install the actuators on a 3/8 to 3/4 in. (9.5 to 19 mm) round shaft or a 3/8 to 5/8 in. (9.5 to 16 mm) square shaft, 2 in. (51 mm) or longer. If the shaft is less than 2 in. (51 mm) long, install an extension recommended by the damper or valve manufacturer. Use the M9000-154 1 in. Jackshaft Coupler Kit for 1 in. (25.4 mm) outside diameter shafts.

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