Work sample of GNA Consulting Engineers by George Nestor, PE. GNACE is a full-service consulting engineering firm, that specializes in Mechanical, Electrical, Plumbing, Fire/Life Safety, Central Utilities, Controls, Telecommunications and Lighting design services. Our services also include Sustainable Design, commissioning and computation fluid dynamics. Our diversified practice parallels our client's demands for various project types including Health Care, Educational, Corporate, Financial, Hospitality, Entertainment, Senior Living, Institutional and Retail.