Calvert Mechanical, Inc. is a small disadvantaged, LDBE, minority, woman –owned business and previously certified with the US Small Business Admin 8(a) Program during the period of December 28, 2000 through December 28, 2009.NAICS CODES: 23511, 233210, 233220, 23310, 233320, 235210, 235310,235420, 235610, 235710, 235910, 235950, 235990Calvert Mechanical, Inc. is a Maryland corporation, incorporated September 9, 1991. Calvert Mechanicals' major focus has evolved and grown steadily from a service company providing Heating, Air Conditioning, Refrigeration service, installation and preventive maintenance into a successful Mechanical Company in the construction sector, performing work for MWAA, WMATA, DCANG, The Air Force, Federal, State and County Government Agencies for Maryland, Virginia and District of Columbia area, while still maintaining the Private Sector clientele.