Gerkin Windows  and Doors-Stringent product testing and innovative design has allowed our products to evolve as market and consumer needs change. In the winter of 1989-90 we started to conceptualize and design our Rhino Commercial Aluminum window and door series. Today we have several commercial window styles and doors in the Rhino line. This window and door series consists of a commercial horizontal slider, casement, single hung, double hung, hopper, awning, fixed and patio door. Each Rhino window reflects the design and manufacturing expertise we’ve implemented over the years. We also publish our AAMA test results to back up our claims of product performance and quality.