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  1. KNOWLEDGE BASE
  2. BEST Exits, Closers, and Hinges
  3. D4990 Templates, Instructions & FAQs

D4990 Templates, Instructions & FAQs

  • D4990 Installation Instructions
  • D4990 Installation Adjustments
  • D4990 Low Energy Operator FAQ's
  • Parts List for D4990
  • What is the max reveal for the pull side mounting on the D4990T?
  • Can a D4990 be used on the pull side of the door?
  • Can a D4990T be used for the push side of the door?
  • Can a D4990 be converted to a D4990T?
  • Can the D4990/D4990T power an electric strike?
  • How to I stop my D4990 drifting closed with 6 on the LED display?
BEST Exits Closers Hinges Commercial Hardware CONTACT
Switch™ Tech Precision 2000 Commercial Door Hardware Corporate Headquarters
6161 East 75th Street
Indianapolis, IN 46250 USA
Phone 855-365-2407
BEST Mechanical Precision 5000 Multifamily
BEST Electromechanical Precision Crossbar
BEST Software D4990
Omnilock Commerical Door Hinges
Non-Standard Product Request Form
BEST Door Closers


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