Knowles Door Check is a third-generation owned Texas business based in Wichita Falls. Brenda and Duff Greathouse purchased Knowles Door Check from Brenda's Father in 1999. Knowles has an excellent reputation for providing industry leading service for custom door hardware requirements on aluminum storefront entrances. Knowles has a keen focus on interpreting door hardware specifications and identifying compatibility issues for aluminum entrances on a project. In my opinion, the specialization by Knowles in aluminum storefront doors/frames presents a great opportunity for glazing contractors required to supply custom door hardware.