QUAD 28K® We Open Doors Simply. Texas Tough. American Made. Non-Handed Automatic Swing Door Operator The industry’s first patented, non-handed, automatic swing door operator simplifies the installation process. The QUAD 28K® boast unique features that make installing our product a dream for virtually anyone. Below are some highlighted features about the Quad 28K® Automatic Door Operator. Patented, Non-Handed Operator Low Energy & High Energy Applications Replace & Retro-fit most operators ETL & UL Listed Product Lightweight & Rugged Design Pairing With A Variety Of Activation Methods & Systems ADA Compliant Adjustable Torque Timing For Faster Door Operation Without Compromising Safety Microprocessor With Adjustable Obstruction Sensing Flip & Rotate Operator To Change Swing Direction. We Open doors. Texas Tough. American Made.