define simultaneous pair.

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The minimum door widths for mounting a Senior Swing are: Concealed 2810 Series: 2811 single door (offset pivot or butt hinge) -- 33". 2811 single door with stop (center pivot) -- 36". 2853 pa...
 Pneumatic Automatic Operators are used in areas where electrically operated devices are not convenient or permitted.  Consists of a modified, heavy-duty door closer for manual oper...
The Senior Swing (2800/9500) Series operator has a 120VAC @ 2.5 Amp current draw for a single door (2811/9531/9542) or simultaneous pair(2853/9553). The independent pair units (2863/9563) have a 12...
The 9550 Sr. Swing is for a simultaneous pair door opening. There is 1 control box with 2 gearboxes that opens both doors together. Uses the 9559-982 companion cable. The 9560 Sr. Swing is for an ...