General Sheet Metal specializes in mechanical, architectural, laser, and HVAC (heating ventilation, and air conditioning) fab ... rication, installation, and repair services. We are a women-owned business certified by the Women’s Business Enterprise National Council. Located in Clackamas, Oregon GSM has proudly served the commercial and industrial markets in the northwest and beyond since 1932. Our dedicated team is readily able to act and react to our clients varying requirements, from standard heating installations to closely controlled ventilation systems for electronic manufacturing facilities, as well as exhaust/ventilation systems needed to meet environmental controls. We routinely work with a variety of materials… fiberglass, plastic, brass, aluminum, steel, galvanized and stainless steel. read more